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Alfred Blaschko, a private practice dermatologist from Berlin, first described and drew the patterns of the lines of Blaschko in 1901. He obtained his data by studying over 140 patients with various nevoid and acquired skin diseases and transposed the visible patterns the diseases followed onto dolls and statues, then compiled the patterns onto a composite schematic of the human body.
In Canadian women, the upper chest is commonly affected. [10] Spider veins on face and neck; Loss of color and fullness in lips; Symptoms of photoaging attributed to prolonged exposure to UV: Wrinkles deepen and forehead frown lines can be seen even when not frowning. Telangiectasias (spider veins) most commonly seen around the nose, cheeks and ...
This is an accepted version of this page This is the latest accepted revision, reviewed on 11 February 2025. "Skin pigmentation" redirects here. For animal skin pigmentation, see Biological pigment. Extended Coloured family from South Africa showing some spectrum of human skin coloration Human skin color ranges from the darkest brown to the lightest hues. Differences in skin color among ...
Characteristic pigmented melanocytes between bundles of collagen. H&E stain. Spitz nevus: A distinct variant of intradermal nevus, usually in a child. They are raised and reddish (non-pigmented). Characteristic vertically arranged nests of cells ("hanging bananas"). H&E stain. Giant pigmented nevus: Large, pigmented, often hairy congenital nevi.
Hyperpigmentation can be diffuse or focal, affecting such areas as the face and the back of the hands. Melanin is produced by melanocytes at the lower layer of the epidermis . Melanin is a class of pigment responsible for producing color in the body in places such as the eyes, skin, and hair.
An intramucosal nevus is a nevus within the mucosa as found in for example the mouth and genital areas. In the mouth, they are found most frequently on the hard palate. They are typically light brown and dome-shaped. [12] Intramucosal nevi account for 64% of all reported case of oral nevi. [13]
Freckles are predominantly found on the face, although they may appear on any skin exposed to the sun, such as arms or shoulders. Heavily distributed concentrations of melanin may cause freckles to multiply and cover an entire area of skin, such as the face. Freckles are rare on infants, and more commonly found on children before puberty.
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 ]