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Nevus anemicus is a congenital disorder characterized by macules of varying size and shape that are paler than the surrounding skin and cannot be made red by trauma, cold, or heat. [ 1 ] [ 2 ] The paler area is due to the blood vessels within the area which are more sensitive to the body’s normal vasoconstricting chemicals.
Nevus depigmentosus is a loss of pigment in the skin which can be easily differentiated from vitiligo. Although age factor has not much involvement in the nevus depigmentosus but in about 19% of the cases these are noted at birth. Their size may however grow in proportion to growth of the body.
Atypical (dysplastic) nevus: This type of nevus must be diagnosed based on histological features. Clinically, atypical nevi are characterized by variable pigmentation and irregular borders. [5] Becker's nevus; Blue nevus (rarely congenital): A classic blue nevus is usually smaller than 1 cm, flat, and blue-black in color. [6] Hori's nevus
Giant pigmented nevus (bathing trunk nevus, congenital nevomelanocytic nevus, garment nevus, giant hairy nevus, nevus pigmentosus et pilosus) Halo nevus (leukoderma acquisitum centrifugum, perinevoid vitiligo, Sutton nevus) Hori's nevus (acquired bilateral nevus of Ota-like macules) Inherited patterned lentiginosis in black persons
Depigmentation is the lightening of the skin or loss of pigment. Depigmentation of the skin can be caused by a number of local and systemic conditions. The pigment loss can be partial (injury to the skin) or complete (caused by vitiligo).
Often called "albino", this amelanistic Burmese python owes its yellow color to unaffected carotenoid pigments.Amelanism (also known as amelanosis) is a pigmentation abnormality characterized by the lack of pigments called melanins, commonly associated with a genetic loss of tyrosinase function.
Skin pigmentation is a frequent disorder that has a number of potential causes. Genetics, sun exposure, and some drugs are the three main factors that contribute to skin pigmentation.
This category reflects the organization of International Statistical Classification of Diseases and Related Health Problems, 10th Revision. Generally, diseases outlined within the ICD-10 codes L80-L81 within Chapter XII: Diseases of the skin and subcutaneous tissue should be included in this category.