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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]
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 vast majority of cSCC cases are located on exposed skin, and are often the result of ultraviolet exposure. cSCC usually occurs on portions of the body commonly exposed to the sun; the face, ears, neck, hands, or arms. The primary sign is a growing bump that may have a rough, scaly surface, and flat, reddish patches.
Once the lesion has grown and progressed to the point where it has breached, penetrated, and infiltrated adjacent structures, it is referred to as "invasive" squamous-cell carcinoma. Once a carcinoma becomes invasive, it is able to spread to other organs and cause the formation of a metastasis , or "secondary tumor".
The human skin is the outer covering of the body and is the largest organ of the integumentary system. The skin has up to seven layers of ectodermal tissue guarding muscles, bones, ligaments and internal organs. Human skin is similar to most of the other mammals' skin, and it is very similar to pig skin.
About 10% of cases do not have lesions on the legs but rather present with one or more skin lesions outside of the legs; ~20% of individuals present with cutaneous lesion(s) but on further or later investigation are found to have disease in non-cutaneous sites such as the lymph nodes, visceral organs, [1] bone marrow, and/or, rarely, central ...
Keratinocytes are the primary type of cell found in the epidermis, the outermost layer of the skin. In humans, they constitute 90% of epidermal skin cells. [1] Basal cells in the basal layer (stratum basale) of the skin are sometimes referred to as basal keratinocytes. [2]
The initial yaws wound contains infectious bacteria, which are passed onto others through skin-to-skin contact, typically during play or other normal childhood interactions. [10] [16] Early (primary and secondary) yaws lesions have a higher bacterial load, thus are more infectious. [2] Both papillomas and ulcers are infectious. [10]