Ota nevus is common in colored people, which may be related to autosomal dominant inheritance. 65% of the patients were born with nevus of OTA, some patients developed nevus of OTA between 10-20 years old, and occasionally appeared nevus of OTA in late stage or pregnancy. The occurrence of nevus of OTA is mainly due to excessive melanocytes in the dermis of the skin, which may come from local nerve tissue. When cells are distributed in the superficial dermis, they tend to be brown, and when they are distributed in the deep dermis, they appear cyan or cyan. The depth of the same color is related to the distribution density of melanocytes.
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