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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.
This skin lesion is quite common in the population, and it can present at birth, known as a congenital meloncytic nevus, or later in life as an acquired nevus. Should the nevi appear in toddler- or school-aged children, they are more likely to remain present throughout the rest of that person's life. [ 4 ]
A: Asymmetrical, meaning the two sides of the mole don’t look alike B: Borders that look irregular, lacy, ill defined C: Color that looks different through the mole that could be brown, black ...
A mole can be either subdermal (under the skin) or a pigmented growth on the skin, formed mostly of a type of cell known as a melanocyte. The high concentration of the body's pigmenting agent, melanin, is responsible for their dark color. Moles are a member of the family of skin lesions known as nevi (singular "nevus"), occurring commonly in ...
This means the mole changes in size, shape or color as time passes. The below image shows how a melanoma changed in shape and border over the course of two years.
An atypical mole may also be referred to as an atypical melanocytic nevus, [2] atypical nevus, B-K mole, Clark's nevus, dysplastic melanocytic nevus, or nevus with architectural disorder. [3] Dysplastic nevi often grow to larger than ordinary moles and may have irregular and indistinct borders.
Others may warrant more thorough examination and biopsy for histopathological examination (looking at a sample of skin under a microscope to detect unique cellular features). For example, a clinician may want to determine whether a pigmented nevus is a type of melanocytic nevus, dysplastic nevus, or melanoma as some of these skin lesions pose a ...
The most common color is blue, although they can be blue-gray, blue-black or even deep brown. The Mongolian spot is a congenital developmental condition exclusively involving the skin . The blue colour is caused by melanocytes , melanin -containing cells, that are deep under the skin. [ 6 ]