Mongolian spot
A Mongolian spot is secondary to dispersed dermal melanocytes.
Most common in Chinese and Japanese, it is also common in South Asians, and can occur in European Caucasians.
It is a blue-gray patch of 10 to 20 cm. While typical over the sacrum, lesions can occur generally.
Most lesions regress by mid-childhood.
Treatment:
- None. The extra sacral involvement is almost always transient.
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