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While only a small number of skin diseases account for most visits to the physician, thousands of skin conditions have been described. Classification of these conditions often presents many nosological challenges, since underlying etiologies and pathogenetics are often not known.
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. Within the latter type, hairs in structures called pilosebaceous units have a hair follicle, sebaceous gland, and associated arrector pili muscle.
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]
The condition can show up on any skin type as a light peachy color and can appear on any place on the body in all sizes. The spots on the skin known as vitiligo are also able to “change” as spots lose and regain pigment; they will stay in relatively the same areas but can move over time and some big patches can move through the years but ...
Atopic dermatitis (AD), also known as atopic eczema, is a long-term type of inflammation of the skin . It results in itchy, red, swollen, and cracked skin. Clear fluid may come from the affected areas, which can thicken over time.
Ichthyosis (also named fish scale disease) is a family of genetic skin disorders characterized by dry, thickened, scaly skin. The more than 20 types of ichthyosis range in severity of symptoms, outward appearance, underlying genetic cause and mode of inheritance (e.g., dominant, recessive, autosomal or X-linked).
Xeroderma pigmentosum ( XP) is a genetic disorder in which there is a decreased ability to repair DNA damage such as that caused by ultraviolet (UV) light. [1] Symptoms may include a severe sunburn after only a few minutes in the sun, freckling in sun-exposed areas, dry skin and changes in skin pigmentation. [1]
Dermatitis is inflammation of the skin, typically characterized by itchiness, redness and a rash. [1] In cases of short duration, there may be small blisters, while in long-term cases the skin may become thickened. [1] The area of skin involved can vary from small to covering the entire body.
Rosacea is a long-term skin condition that typically affects the face. It results in redness, pimples, swelling, and small and superficial dilated blood vessels. Often, the nose, cheeks, forehead, and chin are most involved. A red, enlarged nose may occur in severe disease, a condition known as rhinophyma.
A melanocytic nevus (also known as nevocytic nevus, nevus-cell nevus and commonly as a mole) is usually a noncancerous condition of pigment-producing skin cells. It is a type of melanocytic tumor that contains nevus cells.