Dermatology

Dermatology addresses a host of common and rare problems of the skin, hair, nails, and mucus membranes. Ailments run the gamut from acne and rosacea to hair loss to melanoma.

Learn more about dermatology at the Mount Sinai Health System

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A

Diseases & Conditions
Acanthosis nigricans
Acanthosis nigricans (AN) is a skin disorder in which there is darker, thick, velvety skin in body folds and creases.

Diseases & Conditions
Acne
Acne is a skin condition that causes pimples or "zits. " Whiteheads, blackheads, and red, inflamed patches of skin (such as cysts) may develop.

Self-Care Instructions
Acne - self-care
Acne vulgaris - self-care; Cystic acne - self-care; Pimples - self-care; Zits - self-care

Diseases & Conditions
Acrodermatitis
Acrodermatitis is a childhood skin condition that may be accompanied by mild symptoms of fever and malaise. It may also be associated with hepatitis B and other viral infections. fever malaise

Diseases & Conditions
Actinic keratosis
Actinic keratosis is a small, rough, raised area on your skin. Often this area has been exposed to the sun for a long period of time. Some actinic keratoses may develop into a type of skin cancer.

Diseases & Conditions
Alopecia areata
Alopecia areata is a condition that causes round patches of hair loss. It can lead to total hair loss.

Diseases & Conditions
Athlete's foot
Athlete's foot is an infection of the feet caused by fungus or yeast. The medical term is tinea pedis, or ringworm of the foot.

Diseases & Conditions
Atopic dermatitis
Atopic dermatitis is a long-term (chronic) skin disorder that involves scaly and itchy rashes. It is also called eczema. Other forms of eczema include: Contact dermatitisDyshidrotic eczemaNummular eczemaSeborrheic...

Self-Care Instructions
Atopic dermatitis - children - homecare
Infantile eczema; Dermatitis - atopic children; Eczema - atopic - children

Self-Care Instructions
Atopic dermatitis - self-care
Eczema - self-care; Skin rash - atopic dermatitis

B

Diseases & Conditions
Basal cell skin cancer
Basal cell cancer is the most common form of cancer in the United States. Most skin cancers are basal cell cancer. Basal cell cancer is almost always slow-growing. Other common types of skin cancer are...

Diseases & Conditions
Birthmarks - pigmented
A birthmark is a skin marking that is present at birth. Birthmarks include cafe-au-lait spots, moles, and Mongolian spots. Birthmarks can also be red. Birthmarks can also be red.

Diseases & Conditions
Birthmarks - red
Red birthmarks are skin markings created by blood vessels close to the skin surface. They develop before or shortly after birth.

Symptoms
Blackheads
Blackheads are tiny, dark spots on the skin. They are caused by a small plug in the opening of a follicle (pore). Blackheads are also called open comedones. comedones Related conditions include: AcneWhiteheads...

Diseases & Conditions
Body lice
Body lice are tiny insects (scientific name is Pediculus humanus corporis) that are spread through close contact with other people. Pediculus humanus corporis Two other types of lice are: Head licePubic...

Diseases & Conditions
Boils
A boil is an infection that affects groups of hair follicles and nearby skin tissue. Related conditions include: CarbunculosisFolliculitis Carbunculosis Carbunculosis Folliculitis Folliculitis

Symptoms
Bullae
Bullae are large blisters on the skin that are filled with clear fluid. Many different skin conditions can cause bullae to form. blisters

Diseases & Conditions
Bullous pemphigoid
Bullous pemphigoid is a skin disorder characterized by large blisters. blisters

Injury
Burns
Burns commonly occur by direct or indirect contact with heat, electric current, radiation, or chemical agents. Burns can lead to cell death.

C

Diseases & Conditions
Carbuncle
A carbuncle is a skin infection that often involves a group of hair follicles. The infected material forms a lump, which occurs deep in the skin and may contain pus. When a person has many carbuncles, the...

Special Topics
Cellulite
Cellulite is fat that collects in pockets just below the surface of the skin. It forms around the hips, thighs, and buttocks. Cellulite deposits cause the skin to look dimpled.

Diseases & Conditions
Cellulitis
Cellulitis is a common skin infection caused by bacteria. It affects the middle layer of the skin (dermis) and the tissues below. Sometimes, muscle can be affected.

Special Topics
Chafing
Chafing is skin irritation that occurs where skin rubs against skin, clothing, or other material.

Special Topics
Chapped hands

Special Topics
Chapped lips

Diseases & Conditions
Cherry angioma
A cherry angioma is a noncancerous (benign) skin growth made up of blood vessels.

Symptoms
Comedones
Comedones are small, flesh-colored, white, or dark bumps that give skin a rough texture. The bumps are caused by acne. They are found at the opening of skin pores. A solid core can often be seen in the...

Diseases & Conditions
Contact dermatitis
Contact dermatitis is a condition in which the skin becomes red, sore, or inflamed after direct contact with a substance.

Surgery
Cryotherapy - skin
Cryotherapy is a method of superfreezing tissue in order to destroy it. This article discusses cryotherapy of the skin.

Diseases & Conditions
Cutaneous skin tag
A cutaneous skin tag is a common skin growth. Most of the time, it is harmless.

Symptoms
Cyst
A cyst is a closed pocket or pouch of tissue. It can be filled with air, fluid, pus, or other material.

D

Surgery
Dermabrasion
Dermabrasion is the removal of the top layers of the skin. It is a type of skin-smoothing surgery.

Diseases & Conditions
Dermatitis herpetiformis
Dermatitis herpetiformis is an extremely itchy rash consisting of bumps and blisters. The rash is chronic (long-term), which means it continues over a long period.

Diseases & Conditions
Dermatomyositis
Dermatomyositis is a muscle disease that involves inflammation and a skin rash. It is a type of inflammatory myopathy.

Diseases & Conditions
Dermatoses - systemic
Dermatoses is a general term used to describe any skin defect or lesion on the skin. Systemic means it affects the whole body, rather than just one part. Systemic dermatoses may be linked to problems in...

Symptoms
Dry hair
Dry hair is hair that does not have enough moisture and oil to maintain its normal sheen and texture.

Self-Care Instructions
Dry skin - self-care
Skin - dry; Winter itch; Xerosis; Xerosis cutis

Diseases & Conditions
Dyshidrotic eczema
Dyshidrotic eczema is a condition in which small blisters develop on the hands and feet. The blisters are often itchy. Eczema (atopic dermatitis) is a long-term (chronic) skin disorder that involves scaly...

E

Diseases & Conditions
Ecthyma
Ecthyma is a skin infection similar to impetigo. It is often called deep impetigo because it occurs deep inside the skin. impetigo

Diseases & Conditions
Ectodermal dysplasia
Ectodermal dysplasia is a group of conditions in which there is abnormal development of the skin, hair, nails, teeth, or sweat glands.

Diseases & Conditions
Epidermolysis bullosa
Epidermolysis bullosa is a group of disorders in which skin blisters form after a minor injury. It is passed down in families.

Special Topics
Epithelium

Symptoms
Erosion
Erosion is a breakdown of the outer layers of the skin, usually because of a: CutScrapeInflammation Cut Scrape Inflammation

Diseases & Conditions
Erysipeloid
Erysipeloid is inflammation of the skin caused by bacteria.

Diseases & Conditions
Erythema multiforme
Erythema multiforme is a skin disorder that comes from an allergic reaction or infection. allergic reaction

Diseases & Conditions
Erythema nodosum
Erythema nodosum is an inflammatory disorder. It involves tender, red bumps (nodules) under the skin. nodules

Diseases & Conditions
Erythrasma
Erythrasma is a long-term skin infection caused by bacteria. It commonly occurs in skin folds.

Diseases & Conditions
Erythroplasia of Queyrat
Erythroplasia of Queyrat is an early form of skin cancer found on the penis. The cancer is called squamous cell carcinoma in situ. penis

Diseases & Conditions
Exfoliative dermatitis
Exfoliative dermatitis is widespread scaling, peeling, and flaking of the skin. It is often accompanied by, itching, skin redness (erythroderma), and hair loss. scaling

F

Diseases & Conditions
Female pattern baldness
Female pattern baldness is the most common type of hair loss in women. hair loss

Diseases & Conditions
Folliculitis
Folliculitis is inflammation of one or more hair follicles. It can occur anywhere on the skin.

Diseases & Conditions
Fungal nail infection
Fungal nail infection is a fungus growing in and around your fingernail or toenail.

G

Diseases & Conditions
Giant congenital nevus
A congenital pigmented or melanocytic nevus is a dark-colored, often hairy, patch of skin. A congenital nevus is present at birth or appears in the first year of life. A giant congenital nevus is smaller...

Diseases & Conditions
Granuloma annulare
Granuloma annulare (GA) is a long-term (chronic) skin disease consisting of a rash with reddish bumps arranged in a circle or ring. chronic

H

Symptoms
Hair loss
Partial or complete loss of hair is called alopecia.

Diseases & Conditions
Hemangioma
A hemangioma is an abnormal buildup of blood vessels in the skin or internal organs.

In-depth Report
Herpes simplex
An in-depth report on the causes, diagnosis, treatment, and prevention of herpes simplex.

Diseases & Conditions
Hives
Hives are raised, often itchy, red bumps (welts) on the surface of the skin. They are usually an allergic reaction to food or medicine. They can also appear without cause.

Diseases & Conditions
Hot tub folliculitis
Hot tub folliculitis is an infection of the skin around the lower part of the hair shaft (hair follicles). It occurs when you come into contact with certain bacteria that live in warm and wet areas. folliculitis

Symptoms
Hyperelastic skin
Hyperelastic skin is skin that can be stretched beyond what is considered normal. The skin returns to normal after it is stretched.

Diseases & Conditions
Hypomelanosis of Ito
Hypomelanosis of Ito is a rare birth defect that causes unusual patches of light-colored (hypopigmented) skin and possible neurological and skeletal problems. hypopigmented

I

Diseases & Conditions
Ichthyosis vulgaris
Ichthyosis vulgaris is a skin disorder passed down through families that leads to dry, scaly skin.

Diseases & Conditions
Idiopathic livedo reticularis
Idiopathic or primary livedo reticularis refers to a netlike pattern of reddish-blue skin discoloration. Usually the legs are affected. The condition is linked to swollen blood vessels. It may get worse...

Diseases & Conditions
Impetigo
Impetigo is a common skin infection.

Diseases & Conditions
Incontinentia pigmenti
Incontinentia pigmenti is a skin condition passed down through families. It leads to unusual blistering and changes in skin color.

Symptoms
Intertrigo
Intertrigo is inflammation of the skin. It tends to occur in warm, moist areas of the body where 2 skin surfaces rub or press against each other. Such areas are called "skin folds."

Surgery
Iontophoresis
Iontophoresis involves passing a weak electrical current through the skin. Iontophoresis has a variety of uses in medicine. This article discusses the use of iontophoresis to decrease sweating by blocking...

J

Diseases & Conditions
Jock itch
Jock itch is an infection of the groin area caused by fungus or yeast. The medical term is tinea cruris, or ringworm of the groin.

K

Diseases & Conditions
Keloids
A keloid is a growth of extra scar tissue where the skin has healed after an injury.

Diseases & Conditions
Keratosis obturans
Keratosis obturans is the buildup of extra skin cells and flakey skin in the ear canal. It may be associated with pain or mild hearing loss. It is usually treated by removing the buildup of material and...

Diseases & Conditions
Keratosis pilaris
Keratosis pilaris is a common skin condition in which a protein in the skin called keratin forms hard plugs within hair follicles.

L

Diseases & Conditions
LEOPARD syndrome
LEOPARD syndrome is a very rare inherited disorder in which there are problems with the skin, face, and heart.

Diseases & Conditions
Lamellar ichthyosis
Lamellar ichthyosis is a rare skin condition. It appears at birth and continues throughout life.

Surgery
Laser surgery - skin
Laser surgery uses laser light to remove diseased tissues or treat bleeding blood vessels. Laser surgery may also be used to remove wrinkles, sunspots, tattoos, or birthmarks.

Diseases & Conditions
Lichen planus
Lichen planus is a condition that forms an itchy rash on the skin or in the mouth. rash

Diseases & Conditions
Lichen simplex chronicus
Lichen simplex chronicus is a skin condition caused by chronic itching and scratching. chronic

Symptoms
Lichenified
Lichenified means the skin has become thickened and leathery. This often results from continuously rubbing or scratching the skin. Chronic irritation due to conditions such as eczema can cause lichenified...

Special Topics
Liquid nitrogen
Liquid nitrogen is a chemical that is super cold, about -328°F (-200°C). Liquid nitrogen will instantly freeze anything it touches. It is used to kill cells that make up diseased or cancerous tissue. Tissue...

Diseases & Conditions
Liver spots
Liver spots are flat, brown or black spots that can appear on areas of the skin that are exposed to the sun. They have nothing to do with the liver or liver function.

M

Symptoms
Macule
A macule is a flat, distinct, discolored area of skin that is usually less than 1 centimeter wide. It usually does not include a change in skin texture or thickness.

Diseases & Conditions
Male pattern baldness
Male pattern baldness is the most common type of hair loss in men.

Special Topics
Melanin

Diseases & Conditions
Melanoma
Melanoma is the most dangerous type of skin cancer. It is the leading cause of death from skin disease. Melanoma can also involve the colored part of the eye. Other common types of skin cancer are squamous...

In-depth Report
Melanoma and other skin cancers
An in-depth report on the causes, diagnosis, treatment, and prevention of melanoma and nonmelanoma skin cancers.

Diseases & Conditions
Melasma
Melasma are patches of dark skin that appear on areas of the face that are exposed to the sun.

Surgery
Mohs micrographic surgery
Mohs surgery is a way to treat and cure certain skin cancers. Surgeons trained in the Mohs procedure can do this surgery. It allows skin cancer to be removed with less damage to the healthy skin around...

Diseases & Conditions
Molluscum contagiosum
Molluscum contagiosum is a viral skin infection that causes raised, pearl-like papules or nodules on the skin. papules nodules

Diseases & Conditions
Mongolian blue spots
Mongolian spots are a kind of birthmark that are flat, blue, or blue-gray. They appear at birth or in the first few weeks of life.

N

Symptoms
Nail abnormalities
Nail abnormalities are problems with the color, shape, texture, or thickness of the fingernails or toenails.

Diseases & Conditions
Nevoid basal cell carcinoma syndrome
Nevoid basal cell carcinoma syndrome is a group of defects, passed down through families. The disorder involves the skin, nervous system, eyes, endocrine glands, urinary and reproductive systems, and bones...

Symptoms
Nikolsky sign
Nikolsky sign is a skin finding in which the top layers of the skin slip away from the lower layers when slightly rubbed.

Diseases & Conditions
Nummular eczema
Nummular eczema is a dermatitis (eczema) in which itchy, coin-shaped spots or patches appear on the skin. The word nummular is Latin for "resembling coins."

O

Special Topics
Oily hair

Special Topics
Oily skin

P

Symptoms
Paleness
Paleness is an abnormal loss of color from normal skin or mucous membranes. mucous membranes

Symptoms
Papule
A papule is a solid or cystic raised spot on the skin that is less than one centimeter wide. It is a type of skin lesion. skin lesion

Diseases & Conditions
Paronychia
Paronychia is a skin infection that occurs around the nails.

Symptoms
Patches
A patch is a flat area of color change in the skin that measures 1 centimeter or more in diameter.

Diseases & Conditions
Pemphigus vulgaris
Pemphigus vulgaris (PV) is an autoimmune disorder of the skin. It involves blistering and sores (erosions) of the skin and mucous membranes. autoimmune disorder mucous membranes

Diseases & Conditions
Perioral dermatitis
Perioral dermatitis is a skin disorder in which tiny red bumps form around the mouth and lower half of the face. It can look like acne or rosacea.

Symptoms
Pilonidal sinus disease
Pilonidal sinus disease is am inflammatory condition involving the hair follicles that can occur anywhere along the crease between the buttocks, which runs from the bone at the bottom of the spine (sacrum...

Diseases & Conditions
Pityriasis alba
Pityriasis alba is a common skin disorder of patches of light-colored (hypopigmented) areas.

Diseases & Conditions
Pityriasis rosea
Pityriasis rosea is a common type of skin rash seen in young adults.

Diseases & Conditions
Pityriasis rubra pilaris
Pityriasis rubra pilaris is a rare skin disorder that causes constant inflammation and scaling (exfoliation) of the skin. scaling

Injury
Poison ivy - oak - sumac rash
Poison ivy, oak, and sumac are plants that commonly cause an allergic skin reaction. The result is most often an itchy, red rash with bumps or blisters.

Diseases & Conditions
Polymorphous light eruption
Polymorphous light eruption (PMLE) is a common skin reaction in people who are sensitive to sunlight (ultraviolet light).

Diseases & Conditions
Port-wine stain
A port-wine stain is a birthmark in which swollen blood vessels create a reddish-purplish discoloration of the skin.

Questions To Ask Your Doctor
Pressure ulcers - what to ask your doctor
What to ask your doctor about pressure ulcers; Bedsores - what to ask your doctor

Self-Care Instructions
Preventing pressure ulcers
Decubitus ulcer prevention; Bedsore prevention; Pressure sores prevention

Diseases & Conditions
Psoriasis
Psoriasis is a skin condition that causes skin redness and irritation. Most people with psoriasis have thick, red skin with flaky, silver-white patches called scales. scales

In-depth Report
Psoriasis
An in-depth report on the causes, diagnosis, treatment, and prevention of psoriasis.

Diseases & Conditions
Psoriasis - guttate
Guttate psoriasis is a skin condition in which small, red, scaly teardrop-shaped spots with a silvery scale appear on the arms, legs, and middle of the body. Guttate means "drop" in Latin.

Special Topics
Psoriasis - resources

Diseases & Conditions
Pubic lice
Pubic lice are tiny insects that infect the pubic hair area and lay eggs there. These lice can also be found in armpit hair and eyebrows.

Symptoms
Purpura
Purpura is purple-colored spots and patches that occur on the skin, and in mucus membranes, including the lining of the mouth.

Symptoms
Pustules
Pustules are small, inflamed, pus-filled, blister-like sores (lesions) on the skin surface.

Diseases & Conditions
Pyogenic granuloma
Pyogenic granulomas are small, raised, and red bumps on the skin. The bumps have a smooth surface and may be moist. They bleed easily because of the high number of blood vessels at the site.

R

Symptoms
Rashes
Rashes involve changes in the color or texture of your skin.

Diseases & Conditions
Rhinophyma
Rhinophyma is a large, red-colored (ruddy) nose. The nose has a bulb shape.

Diseases & Conditions
Ringworm
Ringworm is a skin infection due to a fungus or yeast. Often, there are several patches of ringworm on the skin at once. The medical name for ringworm is tinea.

Diseases & Conditions
Rosacea
Rosacea is a chronic skin problem that makes your face turn red. It may also cause swelling and skin sores that look like acne. acne

S

Diseases & Conditions
Scabies
Scabies is an easily-spread skin disease caused by a very small mite.

Symptoms
Scales
Scales are a visible peeling or flaking of outer skin layers. These layers are called the stratum corneum.

Special Topics
Sebaceous adenoma
A sebaceous adenoma is a noncancerous tumor of an oil-producing gland in the skin.

Diseases & Conditions
Sebaceous cyst
A sebaceous cyst is a closed sac under the skin filled with a cheese-like or oily material.

Diseases & Conditions
Seborrheic dermatitis
Seborrheic dermatitis is a common, inflammatory skin condition that causes flaky, white to yellowish scales to form on oily areas such as the scalp, face or inside the ear. It can occur with or without...

Diseases & Conditions
Seborrheic keratosis
Seborrheic keratosis is a condition that causes wart-like growths on the skin. The growths are noncancerous (benign). benign

Diseases & Conditions
Selective deficiency of IgA
Selective deficiency of IgA is the most common immune deficiency disorder. People with this disorder have a low or absent level of a blood protein called immunoglobulin A. immune deficiency disorder

In-depth Report
Shingles and chickenpox (Varicella-zoster virus)
An in-depth report on the causes, diagnosis, treatment, and prevention of shingles and chickenpox.

Symptoms
Skin - abnormally dark or light
Skin that has turned darker or lighter than normal is usually not a sign of a serious medical condition.

Diseases & Conditions
Skin abscess
A skin abscess is a buildup of pus in or on the skin.

Symptoms
Skin blushing/flushing
Skin blushing or flushing is a sudden reddening of the face, neck, or upper chest.

Symptoms
Skin color - patchy
Patchy skin color is areas where the skin color is irregular. Mottling or mottled skin refers to blood vessel changes in the skin that cause a patchy appearance.

Self-Care Instructions
Skin flaps and grafts - self-care
Autograft - self-care; Skin transplant - self-care; Split-skin graft - self-care; Full thickness skin graft - self-care; Partial-dermal skin graft - self-care; FTSG - self-care; STSG - self-care; Local...

Tests
Skin lesion KOH exam
The skin lesion KOH exam is a test to diagnose a fungal infection of the skin. fungal infection of the skin

Tests
Skin lesion aspiration
Skin lesion aspiration is the withdrawal of fluid from a skin lesion (sore). skin lesion

Tests
Skin lesion biopsy
A skin lesion biopsy is when a small amount of skin is removed so it can be examined. The skin is tested to look for skin conditions or diseases. A skin biopsy can help your health care provider diagnose...

Surgery
Skin lesion removal
A skin lesion is an area of the skin that is different than the surrounding skin. This can be a lump, sore, or an area of skin that is not normal. It may also be a skin cancer. Skin lesion removal is a...

Self-Care Instructions
Skin lesion removal-aftercare
Shave excision - skin aftercare; Excision of skin lesions - benign aftercare; Skin lesion removal - benign aftercare; Cryosurgery - skin aftercare; BCC - removal aftercare; Basal cell cancer - removal aftercare...

Symptoms
Skin lumps
Skin lumps are any abnormal bumps or swellings on the skin.

Symptoms
Skin nodules
Skin nodules are solid or cystic raised bumps in the skin that are wider than one centimeter, but less than two centimeters.

In-depth Report
Skin wrinkles and blemishes
An in-depth report on the treatment and prevention of skin wrinkles and blemishes.

Diseases & Conditions
Spider angioma
Spider angioma is an abnormal collection of blood vessels near the surface of the skin.

Diseases & Conditions
Stasis dermatitis and ulcers
Stasis dermatitis is a change in the skin that occurs when blood collects (pools) in the veins of the lower leg.

Diseases & Conditions
Stork bite
A stork bite is a common type of birthmark seen in a newborn. It is most often temporary. The medical term for a stork bite is nevus simplex. A stork bite is also called a salmon patch.

Symptoms
Stretch marks
Stretch marks are irregular areas of skin that look like bands, stripes, or lines. Stretch marks are seen when a person grows or gains weight rapidly or has certain diseases or conditions. The medical name...

Special Topics
Subcutaneous
The term "cutaneous" refers to the skin. Subcutaneous means beneath, or under, all the layers of the skin. For example, a subcutaneous cyst is under the skin. cyst

Self-Care Instructions
Sun protection
Many skin changes, such as skin cancer, wrinkles, and age spots are caused by exposure to the sun. The two types of sun rays that can injure the skin are ultraviolet A (UVA) and ultraviolet B (UVB). UVA...

Symptoms
Sunburn
A sunburn is reddening of the skin that occurs after you are exposed to the sun or other ultraviolet light.

Symptoms
Sweating - absent
An abnormal lack of sweat in response to heat may be harmful, because sweating allows heat to be released from the body. The medical term for absent sweating is anhidrosis.

Diseases & Conditions
Swimming pool granuloma
A swimming pool granuloma is a long-term (chronic) skin infection. It is caused by the bacteria Mycobacterium marinum. Mycobacterium marinum

T

Symptoms
Telangiectasia
Telangiectasias are small, widened blood vessels on the skin. They are usually harmless, but may be associated with several diseases.

Diseases & Conditions
Tinea capitis
Tinea capitis is a fungal infection of the scalp. It is also called ringworm of the scalp. ringworm Related skin infections may be found: In a man's beardIn the groin (jock itch)Between the toes (athlete...

Diseases & Conditions
Tinea corporis
Tinea corporis is a skin infection that is caused by fungi. It is also called ringworm. ringworm Related skin fungus infections may appear: On the scalpIn a man's beardIn the groin (jock itch)Between the...

Diseases & Conditions
Tinea versicolor
Tinea versicolor is a long-term (chronic) fungal infection of the skin. fungal infection of the skin

Diseases & Conditions
Trichorrhexis nodosa
Trichorrhexis nodosa is a problem in which thickened or weak points (nodes) along the hair shaft cause your hair to break off easily.

U

Diseases & Conditions
Urticaria pigmentosa
Urticaria pigmentosa is a skin disease that produces patches of darker skin (lesions) and very bad itching. Hives can develop when these skin areas are rubbed. lesions itching

V

Symptoms
Vesicles
A vesicle is a small fluid-filled blister on the skin.

Diseases & Conditions
Vitiligo
Vitiligo is a skin condition in which there is a loss of color (pigment) from areas of skin. This results in uneven white patches that have no pigment, but the skin feels like normal. patches

W

Diseases & Conditions
Warts
Warts are small, usually painless growths on the skin. Most of the time they are harmless. They are caused by a virus called human papillomavirus (HPV). Some types of warts are spread through sex. Certain...

Symptoms
Whiteheads
Whiteheads are small, white, raised bumps on the skin. They form when oil and skin collect in the pores. Whiteheads are also known as closed comedomes and pimples. They occur with acne. comedomes acne.

Tests
Wood's lamp examination
A Wood's lamp examination is a test that uses ultraviolet (UV) light to look at the skin closely.

Symptoms
Wrinkles
Wrinkles are creases in the skin. They are also called rhytids.

X

Diseases & Conditions
Xanthoma
Xanthoma is a skin condition in which certain fats build up under the surface of the skin.

Diseases & Conditions
Xeroderma pigmentosum
Xeroderma pigmentosum is a rare condition passed down through families in which the skin and tissue covering the eye are extremely sensitive to ultraviolet light. Some people also develop nervous system...

Diseases & Conditions
Xerosis
Xerosis is an abnormal dryness of the skin or mucus membranes.