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Acanthosis nigricans is a medical sign characterised by brown-to-black, poorly defined, velvety hyperpigmentation of the skin. [1] It is usually found in body folds, [ 2 ] such as the posterior and lateral folds of the neck , the armpits , groin , navel , forehead and other areas.
The distinctive solid black colour of the Ayam Cemani (rooster shown) chicken breed is due to hyperpigmentation, with the bird's feathers, skin, beak and internal organs all being affected. Hyperpigmentation can be caused by sun damage, inflammation, or other skin injuries, including those related to acne vulgaris.
Positive histologic stains that aid in the diagnosis of conditions of or affecting the human integumentary system Stain Cell, material, and/or structure(s) stained Condition(s) in which stain is positive Actin-specific enolase: Infantile digital fibromatosis: AE1/AE3: Squamous cell carcinoma: Alcian blue: Lipoid proteinosis Papular mucinosis ...
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.
Congenital nevus. Note the variable coloration and slightly irregular border. The congenital melanocytic nevus appears as a circumscribed, light brown to black patch or plaque, potentially very heterogeneous in consistency, covering any size surface area and any part of the body.
When dyeing your hair, it’s much easier to take a few preventative steps than to remove the dye off your skin once it’s stained. Here's what a few pros suggest.
Mongolian spot is a congenital developmental condition—that is, one existing from birth—exclusively involving the skin.The blue colour is caused by melanocytes, melanin-containing cells, that are usually located in the surface of the skin (the epidermis), but are in the deeper region (the dermis) in the location of the spot. [6]
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