Acne Vulgaris - A skin condition characterized by red pimples on the skin, especially on the face, due to inflamed or infected sebaceous glands and prevalent chiefly among adolescents.

Acne Rosacea - It is a complication of acne rosacea, a disease in which the skin of the face is affected first by pronounced flushing and later by the formation of nodules and pustules. The keratitis causes severe pain and corneal scarring with impairment of vision.

Adiposis Dolorosa

Albinism - The affected person has milk-white skin and hair, though the skin may be slightly pinkish in colour owing to underlying blood vessels. The iris of the eye appears pink, while the pupil itself appears red from light reflected by blood in the unpigmented choroid. Vision abnormalities such as astigmatism, nystagmus (rapid involuntary oscillation of the eye), and photophobia (extreme sensitivity to light) are common.

Alopecia - The lack or loss of hair. Two primary types of baldness can be distinguished: permanent hair loss arising from the destruction of hair follicles, and temporary hair loss arising from transitory damage to the follicles.

Angioneurotic Edema - Also called GIANT URTICARIA, allergic disorder in which large, localized, painless swellings similar to hives appear under the skin. It causes a hereditary disposition, after infection or injury. The reaction appears suddenly and persists for a few hours or days, occurring most often on the face, hands, feet, genitals, and mucous membranes.

Blister - A small bubble on the skin filled with serum and caused by friction, burning, or other damage.

Cafe-au-Lait Spots

Cellulitis - Infections of the skin and subcutaneous tissue are called cellulitis. The condition is characterized by an area of redness, warmth, swelling, and tenderness, usually well differentiated from the surrounding tissues.

Cutis Laxa - Disorder, either inherited or acquired, in which the skin hangs in loose folds, hooked nose, with nostrils opening outward, and a long upper lip.

CREST ( --> Scleroderma) - Also called Progressive Systemic Sclerosis, chronic skin disease that hardens and fixes the skin to the underlying structures. The disease affects women more often than men and may begin at any age, but usually symptoms appear between the ages of 25 and 55. It causes the skin to lose normal elasticity.

Dermatitis - Also called ECZEMA, an inflammation of the skin. It is usually characterized by redness, swelling, blister formation, and oozing and almost always by itching.

Dermatitis, Exfoliative - Generalized redness and scaling of the skin that usually arises as a complication of a preexisting skin disease or of an allergy.  Itching is variable and may be intense. The continuous shedding of the scales results in a significant loss of body protein. The maintenance of body temperature is also affected, because of the plugging of a majority of sweat ducts; the patient feels cold and feverish.

Darier Disease ( --> Keratosis Follicularis) - Keratosis pilaris, also called ichthyosis follicularis, lichen pilaris, or follicular xeroderma, is a condition in which abnormal keratinization is limited to the hair follicles, manifesting itself as discrete, tiny follicular papules (solid, usually conical elevations); they are most commonly seen on the outer surface of the arms and thighs.

Dyshidrosis ( --> Eczema) - Eczema of the skin of the outer ear, is an itching, scaling redness, sometimes with weeping of the affected skin. It is often the result of an allergy to a food or substance such as hair spray that comes in contact with the skin.

Vitiligo - Also called Leukoderma, hereditary patchy loss of melanin pigment from the skin. Vitiligo appears clinically as milk-white, irregularly oval patches of skin, which are small at the beginning but enlarge gradually. These patches are roughly symmetrical and are seen most commonly on the hands, wrists, face, neck, and upper trunk. The hair growing in the depigmented area is also white. It causes a cosmetic problem that can be serious in dark-skinned individuals.

Eczema - It causes itching, scaling redness, sometimes with weeping of the affected skin. It is often the result of an allergy to a food or substance such as hair spray that comes in contact with the skin.

Ehlers - Danlos Syndrome - Rare, heritable disorder characterized by great elasticity of the skin, skin fragility with a tendency to hemorrhage, poor scar formation, and hyperextensibility of the joints ("elastic men"). The skin is velvety and bruises easily, and the ears tend to droop; dislocations of joints are frequent.

Epidermolysis Bullosa - Psoriasis and the rare hereditary blistering disorders collectively called epidermolysis bullosa owe their distributions to local trauma; lesions that show a predilection for the elbows, knees, and lower back are common in psoriasis, and those found in the hands, feet, knees, and mouth of children are indicative of epidermolysis bullosa.

Erysipelas - Contagious infection of the skin and underlying tissue. It causes affected areas of skin to turn bright red and become slightly swollen. The swollen blotches have a distinct border and slowly expand into the surrounding skin. The lesions are most commonly seen on the face, scalp, hands, and legs. They feel hot to the touch and the patient is feverish.

Erythema - Any abnormal redness of the skin. It is caused by dilation and irritation of the superficial capillaries; the augmented flow of blood through them imparts a reddish hue to the skin. It may arise from a great variety of causes and disease conditions.

Exanthema Subitum - Also called Exanthem Subitum, infectious disease of early childhood marked by rapidly developing high fever (to 106 F) lasting about three days and then subsiding completely. A few hours after the temperature returns to normal, a mildly itchy rash develops suddenly on the trunk, neck, and behind the ears but fades rapidly after two days. The disease appears to be caused by a filterable virus and is especially contagious.

Hypohidrosis

Hyperhidrosis - It is the abnormal excessive secretion of sweat, usually on the palms and soles and in the axillae. Emotional stress normally stimulates sweating in these areas, but in hyperhidrosis excessive sweating may follow minor stimuli or no obvious stimulus at all. It may be an occupational problem for those who handle books, papers, or metallic objects that can rust.

Hidradenitis Suppurativa

Hair Diseases

Granuloma Annulare - A mass of granulation tissue, typically produced in response to infection, inflammation, or the presence of a foreign substance.

Furunculosis - Also called FURUNCLE, a staphylococcus skin infection characterized by an inflamed nodular swelling filled with pus, located at the site of a hair follicle. The lesion is painful and feels hard to the touch; healing begins after the pus is discharged. Boils are usually located in hairy body areas exposed to friction and maceration, such as the back of the neck, the face, armpits, buttocks, and groin.

Hirsutism - Abnormal hairiness that may be localized or cover the entire body.

Hives ( --> Urticaria) - Allergic skin reaction characterized by the sudden appearance of slightly raised, smooth, flat-topped wheals and plaques that are usually redder or paler than the surrounding skin and are attended by severe itching.

Ichthyosis - Also called Fish-skin Disease, or Xeroderma, a hereditary condition involving dryness and scaliness of the skin brought about by excessive growth of the horny outermost covering of the skin. It may sometimes be associated with a deficiency of the sweat glands and, less frequently, with irregularities in the growth of hair, teeth, and nails. In its mild and simplest form, it is probably the most common of the hereditary skin disturbances.

Keloid - Fibrous tissue overgrowth occurring in scars. Usually only the skin layers are affected in this manner. Scars of the mucous membranes or deeper tissues do not form keloids.

Keratosis, Actinic - A horny growth, especially on the skin.

Keratosis Follicularis - Keratosis pilaris, also called ichthyosis follicularis, lichen pilaris, or follicular xeroderma, is a condition in which abnormal keratinization is limited to the hair follicles, manifesting itself as discrete, tiny follicular papules (solid, usually conical elevations). They are most commonly seen on the outer surface of the arms and thighs.

Keratosis, Seborrheic - It is a benign skin tumour, ordinarily developing as a small yellow or brown, sharply marginated, slightly raised protuberance, covered by a thin greasy scale. These lesions result from an abnormal increase in the number of keratinocytes and seldom either undergo malignant changes or disappear spontaneously.

Immersion Foot - Also called TRENCH FOOT, a painful disorder of the foot involving damage to the skin, nerves, and muscle that is caused by prolonged exposure to cold dampness or by prolonged immersion in cold water.

Nails, Ingrown

Lichen Planus - The skin has an inherent region-specific anatomical diversity that may profoundly modify the appearance of a rash. This is apparent when skin transplanted from one area of the body to another (other than a symmetrically opposite area) retains the morphological characteristics of the donor area. Thus the morphology of eczema or lichen planus on the palms and soles may bear little or no resemblance to the same disease in the same individual on the face or scalp.

Lichen Sclerosus et Atrophicus

Lipodystrophy - It may be the result of injury to the local area.

Lupus Erythematosus, Cutaneous - Either of two distinct inflammatory diseases--discoid lupus erythematosus and systemic lupus erythematosus. Discoid lupus erythematosus is a disease of the skin that affects women more often than men. Distinct reddened patches covered with grayish brown scales may appear on the upper cheeks and the nose, on the scalp, the lips, or the lining of the cheeks. The lesions on the outside of the cheeks and on the nose often are in a butterfly pattern.

Lupus Erythematosus, Systemic - Also called disseminated lupus erythematosus, or SLE, may affect any organ or structure of the body, especially the skin, the joints, the kidneys, the heart, the serous membranes (membranes that exude moisture, such as those of the joints or those lining the abdomen), and the lymph nodes.

Lentigo - A condition marked by small brown patches on the skin, typically in elderly people.

Leg Ulcer

Mixed Connective Tissue Disease - Any of the diseases that affect human connective tissue. 

Marfan Syndrome - Also called Arachnodactyly, rare hereditary disorder of connective-tissue development in humans that affects several body systems, most notably the skeleton, heart, and eye. Affected individuals are tall, their limbs are long and thin, their fingers are long and may be described as spider-like, and there is a tendency to double-jointedness. The lens of the eye is dislocated (a diagnostic sign), and there is a high frequency of glaucoma or retinal detachment. The heart muscle has an abnormal composition, and a variety of malfunctions and malformations occur; rupture of the aorta is the commonest cause of death.

Mastocytosis

Parapsoriasis

Panniculitis

Nail Diseases

Miliaria ( --> Sweat Gland Diseases) - An inflammatory disorder of human skin, characterized by multiple small lesions at the site of sweat pores, brought about by the blockage of sweat ducts and the resulting escape of sweat into various levels of the skin. 

Menke's Syndrome( --> Hair Diseases ) - A familial disorder of copper metabolism presenting with seizures and the growth of abnormal hair.

Pemphigus - A group of diseases characterized by the development of large water blisters on otherwise normal - appearing skin or mucous surfaces.

Pemphigus, Benign Familial - A skin disease in which watery blisters form on the skin.

Pigmentation Disorders

Paronychia - Infection of the soft tissue of the fingers between the lateral edges of the nail plates and the lateral nail folds.

Pemphigoid, Bullous - Also called BENIGN PEMPHIGUS, a chronic, generalized skin disorder characterized by an eruption of serum-filled vesicles (blisters).

Pseudoxanthoma Elasticum - Also called GRÖNBLAD-STRANDBERG SYNDROME, inherited disease in which the premature breakdown of exposed skin occurs. It is characterized by eruptions of yellow plaques and thickening and grooving of the skin on the face, neck, and sometimes the armpits, abdomen, and groin. The skin loses its elasticity and hangs loosely from underlying structures. Affected persons show signs of poor circulation in the extremities; leg muscles tire easily, and spontaneous bleeding into the tissues or from any opening is common.

Pityriasis - A skin disease characterized by the shedding of fine flaky scales.

Port-Wine Stain - A kind of large, deep red birthmark, a persistent haemangioma or naevus, typically on the face.

Pruritus - A stimulation of free nerve endings, usually at the junction of the dermis and epidermis of the skin, that evokes a desire to scratch. It has been suggested that an itch is a subthreshold sensation of pain.

Psoriasis - A chronic, recurrent skin disorder, characterized by reddish, slightly elevated plaques or papules (solid elevations) covered with silvery-white scales. In most cases, the lesions tend to be symmetrically distributed on the elbows and knees, scalp, chest, and buttocks. The lesions may remain small and solitary or coalesce into large plaques that often form geometrical patterns with a central area of normal skin. The nails, frequently involved, become thickened, irregularly laminated, and brittle.

Pyoderma Gangrenosum - A skin infection with formation of pus.

Roseola - Also called Exanthem Subitum, infectious disease of early childhood marked by rapidly developing high fever (to 106 F) lasting about three days and then subsiding completely. A few hours after the temperature returns to normal, a mildly itchy rash develops suddenly on the trunk, neck, and behind the ears but fades rapidly after two days. 

Scleroderma, Systemic - Also called Progressive Systemic Sclerosis, chronic skin disease that hardens and fixes the skin to the underlying structures.

Skin Diseases, Infectious

Skin Ulcer

Stevens - Johnson Syndrome

Stickler/Marshall Syndrome (not on MeSH)

Sweet's Syndrome

Tinea Versicolor

Urticaria - Anallergic skin reaction characterized by the sudden appearance of slightly raised, smooth, flat-topped wheals and plaques that are usually redder or paler than the surrounding skin and are attended by severe itching.

Weber-Christian disease (--> Panniculitis)

Xeroderma Pigmentosum - Rare, recessively inherited skin condition. On exposure to such radiation the skin erupts into numerous pigmented spots, resembling freckles, which tend to develop into multiple carcinomas.