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The two main types of human skin are: glabrous skin, the hairless skin on the palms and soles (also referred to as the "palmoplantar" surfaces), and hair-bearing skin. [3] Within the latter type, the hairs occur in structures called pilosebaceous units , each with hair follicle , sebaceous gland , and associated arrector pili muscle. [ 4 ]
Schamberg's disease, or progressive pigmented purpuric dermatosis, is a chronic discoloration of the skin which usually affects the legs and often spreads slowly. This disease is more common in males and may occur at any age from childhood onward. This condition is observed worldwide and has nothing to do with race or ethnic background.
Keratosis pilaris. Keratosis pilaris ( KP; also follicular keratosis, lichen pilaris, or colloquially chicken skin[ 1]) is a common, autosomal - dominant, genetic condition of the skin's hair follicles characterized by the appearance of possibly itchy, small, gooseflesh -like bumps, with varying degrees of reddening or inflammation. [ 2]
Werner syndrome (WS) or Werner's syndrome, also known as "adult progeria ", [ 1] is a rare, autosomal recessive disorder [ 2] which is characterized by the appearance of premature aging. [ 3] Werner syndrome is named after the German scientist Otto Werner. [ 4] He identified the syndrome in four siblings observed with premature aging, which he ...
The skin weighs an average of 4 kg (8.8 lb), covers an area of about 2 m 2 (22 sq ft), and is made of three distinct layers: the epidermis, dermis, and subcutaneous tissue. [1] The two main types of human skin are glabrous skin, the nonhairy skin on the palms and soles (also referred to as the "palmoplantar" surfaces), and hair-bearing skin. [16]
Psoriasis. Psoriasis is a long-lasting, noncontagious autoimmune disease characterized by patches of abnormal skin. [ 4][ 5] These areas are red, pink, or purple, dry, itchy, and scaly. [ 8][ 3] Psoriasis varies in severity from small localized patches to complete body coverage. [ 3] Injury to the skin can trigger psoriatic skin changes at that ...
Sarcoptes is a genus of skin parasites, and part of the larger family of mites collectively known as "scab mites". They are also related to the scab mite Psoroptes, also a mite that infests the skin of domestic animals. Sarcoptic mange affects domestic animals and similar infestations in domestic fowls cause the disease known as "scaly leg".
Prurigo nodularis ( PN ), also known as nodular prurigo, is a skin disorder characterized by pruritic ( itchy ), nodular lesions, which commonly appear on the trunk, arms and legs. [ 1] Patients often present with multiple excoriated nodules caused by chronic scratching. Although the exact cause of PN is unknown, PN is associated with other ...