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Dermatology, allergy and immunology Dermatographic urticaria is a skin disorder and one of the most common types of urticaria , affecting 2–5% of the population. [ 1 ] [ 2 ]
So common, in fact, that between 1.5 percent and 33 percent of the population may get melasma between the ages of 20 and 40, according to the the Cleveland Clinic. Still, it can be hard to know ...
Most of these conditions present with cutaneous surface changes termed "lesions," which have more or less distinct characteristics. [30] Often proper examination will lead the physician to obtain appropriate historical information and/or laboratory tests that are able to confirm the diagnosis. [ 29 ]
The skin weighs an average of four kilograms, covers an area of two square metres, 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 hairless skin on the palms and soles (also referred to as the "palmoplantar" surfaces), and hair-bearing skin. [3]
The area of skin involved can vary from small to covering the entire body. [1] [2] Dermatitis is also called eczema but the same term is often used for the most common type of skin inflammation, atopic dermatitis. [7] The exact cause of the condition is often unclear. [2] Cases may involve a combination of allergy and poor venous return. [1]
Impetigo is a contagious bacterial infection that involves the superficial skin. [2] The most common presentation is yellowish crusts on the face, arms, or legs. [2] Less commonly there may be large blisters which affect the groin or armpits. [2]
Malassezia folliculitis or pityrosporum folliculitis, [1] is a skin condition caused by infection by Malassezia (formerly Pityrosporum) yeast. [2]: 314 The skin of the upper trunk area including the back, chest, arms and sometimes the neck is often affected and this condition is often seen in young to middle aged adults, although it has been known to occur in adults well into their sixties ...
After an inflamed nodular acne lesion resolves, it is common for the skin to darken in that area, which is known as postinflammatory hyperpigmentation (PIH). The inflammation stimulates specialized pigment-producing skin cells (known as melanocytes ) to produce more melanin pigment, which leads to the skin's darkened appearance. [ 36 ]