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It often requires a dermatologist to fully evaluate moles. For instance, a small blue or bluish-black spot, often called a blue nevus, is usually benign but often mistaken for melanoma. [23] Conversely, a junctional nevus, which develops at the junction of the dermis and epidermis, is potentially cancerous. [24]
[15] [16] While only a small number of skin diseases account for most visits to the physician, thousands of skin conditions have been described. [14] Classification of these conditions often presents many nosological challenges, since underlying etiologies and pathogenetics are often not known.
Flexural: on the front of the fingers; Extensor: on the back of the fingers; Intertriginous: in an area where two skin areas may touch or rub together; Morbilliform: resembling measles; Palmoplantar: on the palm of the hand or bottom of the foot; Periorificial: around an orifice such as the mouth; Periungual/subungual: around or under a ...
Not only is it common, but you can usually trace bouts of adult acne to specific root causes based on where it appears.
Like liver spots, seborrheic keratoses are seen more often as people age. [4] The tumours (also called lesions) appear in various colours, from light tan to black. They are round or oval, feel flat or slightly elevated, like the scab from a healing wound, and range in size from very small to more than 2.5 centimetres (1 in) across. [5]
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]
Such cells might then aggregate into a spot with an irregular shape. [13] They propose that the protrusion of a flat spot is a result of the death of aged cells in the spot and release of lipofuscin bodies. [13] The aggregating cells would form a capsule, and the dense lipofuscin bodies make the protruding spot soft and dark in color. [13]
A beauty mark or beauty spot is a euphemism for a type of dark facial mark so named because such birthmarks are sometimes considered an attractive feature. [1] Medically, such "beauty marks" are generally melanocytic nevus, more specifically the compound variant. Moles of this type may also be located elsewhere on the body, and may also be ...