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Dyshidrosis is a type of dermatitis, characterized by itchy vesicles of 1–2 mm in size, on the palms of the hands, sides of fingers, or bottoms of the feet. [8] Outbreaks usually conclude within three to four weeks, but often recur.
Also known as "true" leukonychia, this is the most common form of leukonychia, in which small white spots appear on the nails. Picking and biting of the nails are a prominent cause in young children and nail biters. Besides parakeratosis, air that is trapped between the cells may also cause this appearance. [5] It is also caused by trauma.
Paronychia is more common in women than in men, by a ratio of three to one. Usually, they affect manual-labor workers or people in occupations that require them to have their hands or feet submerged in water for prolonged periods (e.g., dishwashers). Middle-aged females are at the highest risk of infection. [16]
Male. Upperside brown. Forewing without markings, but shading darker at the costa and outer margin. Hindwing with the abdominal fold grey, with a white cilia, a small black spot on the inner side of the anal lobe, and a still smaller and indistinct black spot in each of the next two interspaces, the two latter capped with dull orange, and all three outwardly edged with white; tails black ...
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]
The adult males grow up to 13–15 millimetres (0.51–0.59 in) long, while females can reach 15–18 millimetres (0.59–0.71 in) of length. In both sexes, the basic coloration of the body is light green, with many small black spots. The eyes are bright orange.
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]