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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 most common symptoms are severe itchiness and a pimple-like rash. [2] Occasionally, tiny burrows may appear on the skin. [2] In a first-ever infection, the infected person usually develops symptoms within two to six weeks. [2] During a second infection, symptoms may begin within 24 hours. [2]
Skin cancer is the most commonly diagnosed form of cancer in humans. [11] [12] [13] There are three main types of skin cancers: basal-cell skin cancer (BCC), squamous-cell skin cancer (SCC) and melanoma. [1] The first two, along with a number of less common skin cancers, are known as nonmelanoma skin cancer (NMSC).
Atopic dermatitis (AD), also known as atopic eczema, is a long-term type of inflammation of the skin. [2] AD is also often called simply eczema but the same term is also used to refer to dermatitis, the larger group of skin conditions. [2][5] AD results in itchy, red, swollen, and cracked skin. [2] Clear fluid may come from the affected areas ...
Cutaneous or skin sporotrichosis; This is the most common form of this disease. Symptoms of this form include nodular lesions or bumps in the skin, at the point of entry and also along lymph nodes and vessels. The lesion starts off small and painless, and ranges in color from pink to purple.
Impetigo is a 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] The lesions may be painful or itchy. [3] Fever is uncommon. [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]
What it looks like: The most recognizable reaction on this list is the bullseye rash—a large, red, target-like rash that signals the early stages of Lyme disease from the bite of an infected ...
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