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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]
Fissure is a lesion in the skin that is usually narrow but deep. [29] [33] Induration is dermal thickening causing the cutaneous surface to feel thicker and firmer. [29] Atrophy refers to a loss of skin, and can be epidermal, dermal, or subcutaneous. [30] With epidermal atrophy, the skin appears thin, translucent, and wrinkled. [29]
Lesions are often classified by their tissue types or locations. For example, "skin lesions" or "brain lesion" are named for the tissue where they are found.If there is an added significance to regions within the tissue—such as in neural injuries where different locations correspond to different neurological deficits—they are further classified by location.
Nevus (pl.: nevi) is a nonspecific medical term for a visible, circumscribed, chronic lesion of the skin or mucosa. [1] The term originates from nævus, which is Latin for "birthmark"; however, a nevus can be either congenital (present at birth) or acquired.
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 ...
patient clenches fist over chest when asked to describe pain Lhermitte's sign: Jean Lhermitte: neurology: lesions of cervical cord dorsal columns or caudal medulla, MS, chemotherapy, Behçet's disease: electrical sensation down the back and into limbs with neck flexion or extension Liebermeister's rule: Carl von Liebermeister: internal medicine
In Canada, the most common skin cancer is basal-cell carcinoma (as much as one-third of all cancer diagnoses), affecting 1 in 7 individuals over a lifetime. [66] This tumor accounts for approximately 70% of non-melanoma skin cancers. In 80 percent of all cases, basal-cell carcinoma affects the head or neck skin. [65]
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.