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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]
Ecthyma gangrenosum is a type of skin lesion characterized by vesicles or blisters which rapidly evolve into pustules and necrotic ulcers with undermined tender erythematous border. " Ecthyma " means a pus forming infection of the skin with an ulcer, "gangrenosum" refers to the accompanying gangrene or necrosis.
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]
What it looks like: Purplish lesions on the inner arms, legs, wrists, or ankles can signify lichen planus, a skin rash triggered by an overreaction of the immune system.
Cutaneous B-cell lymphomas (CBCL), more recently termed Primary cutaneous B-cell lymphomas and lymphoproliferative disorders (PCBCLPD), are a group of disorders that typically present as skin lesions consisting of proliferating B-cells. B-cells are a type of lymphocyte involved in regulating immune responses.
Physical examinations look for signs of erythematous rashes and swelling of areas exposed to sun, including face, upper neck or back, and primary skin lesions which includes vesicle and blisters. [2] [4] For diagnostic uncertainty of photodermatoses, a medical professional may use other means to diagnose.
A papule is a small, well-defined bump in the skin. [2] It may have a rounded, pointed or flat top, and may have a dip. [2] It can appear with a stalk, be thread-like or look warty. [3] It can be soft or firm and its surface may be rough or smooth. [2] Some have crusts or scales. [2]
A lentigo (/ l ɛ n ˈ t aɪ ɡ oʊ /) (plural lentigines, / l ɛ n ˈ t ɪ dʒ ɪ n iː z /) is a small pigmented spot on the skin with a clearly defined edge, surrounded by normal-appearing skin. It is a harmless (benign) hyperplasia of melanocytes which is linear in its spread.