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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]
With regard to morphology, the initial lesion that characterizes a condition is known as the "primary lesion", and identification of such a lesions is the most important aspect of the cutaneous examination. [30] Over time, these primary lesions may continue to develop or be modified by regression or trauma, producing "secondary lesions". [1]
Cutaneous small-vessel vasculitis (CSVV) is inflammation of small blood vessels, usually accompanied by small lumps beneath the skin. [1]: 831 [2] The condition is also known as hypersensitivity vasculitis, cutaneous leukocytoclastic vasculitis, hypersensitivity angiitis, cutaneous leukocytoclastic angiitis, cutaneous necrotizing vasculitis and cutaneous necrotizing venulitis, [3]
Skin ulcers appear as open craters, often round, with layers of skin that have eroded. The skin around the ulcer may be red, swollen, and tender. Patients may feel pain on the skin around the ulcer, and fluid may ooze from the ulcer. In some cases, ulcers can bleed and, rarely, patients experience fever. Ulcers sometimes seem not to heal ...
Primary cutaneous coccidioidomycosis is a skin condition caused by Coccidioides immitis following a definite history of inoculation or a colonized splinter found in the skin lesion. [ 1 ] : 315 See also
This initial skin lesion typically heals after 3–6 months. After weeks to years, joints and bones may become painful, fatigue may develop, and new skin lesions may appear. [6] The skin of the palms of the hands and the soles of the feet may become thick and break open. The bones (especially those of the nose) may become misshapen.
Some examples of viral skin infections include: Warts, benign proliferative skin lesions that are caused by human papilloma virus (HPV). [30] [31] Warts vary in shape, size, appearance, and location on the body where they occur. For example, plantar warts (verrucae plantaris), occur on the soles of the feet and appear as thick calluses.
List of genes mutated in pigmented cutaneous lesions; List of histologic stains that aid in diagnosis of cutaneous conditions; List of human leukocyte antigen alleles associated with cutaneous conditions; List of immunofluorescence findings for autoimmune bullous conditions; List of inclusion bodies that aid in diagnosis of cutaneous conditions