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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 ]
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 ...
Acne. What it looks like: Acne causes red, discolored bumps on the skin, along with whiteheads, blackheads, and cysts. Other symptoms to note: Acne is the most common skin condition affecting ...
Perioral dermatitis, also known as periorificial dermatitis, is a common type of inflammatory skin rash. [ 2] Symptoms include multiple small (1–2 mm) bumps and blisters sometimes with background redness and scale, localized to the skin around the mouth and nostrils. Less commonly, the eyes and genitalia may be involved. [ 3]
Taenia solium, the pork tapeworm, belongs to the cyclophyllid cestode family Taeniidae. It is found throughout the world and is most common in countries where pork is eaten. It is a tapeworm that uses humans as its definitive host and pigs as the intermediate or secondary hosts. It is transmitted to pigs through human feces that contain the ...
Dermatology. Causes. Malassezia globosa, Malassezia furfur. Tinea versicolor (also pityriasis versicolor) is a condition characterized by a skin eruption on the trunk and proximal extremities. [ 1] The majority of tinea versicolor is caused by the fungus Malassezia globosa, although Malassezia furfur is responsible for a small number of cases ...
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 ...