母斑在医学上称为「胎记」或「痣」，是皮肤组织在发育时异常的增生，在皮肤表面出现形状和颜色的异常。
有时，“母斑”会发生在隐秘的部分（例如腋窝）并且不能马上被发现。
Occasionally, the "herald patch" may occur in a hidden position (armpit, for example) and not be noticed immediately.
用此法治疗太田母斑是非常有效的。
This method is very effective in the treatment of Ota nevus.
母斑也会表现为一小片小的椭圆形斑点，而被误认为是粉刺。
The "herald" patch may also appear as a cluster of smaller oval spots, and be mistaken for acne.
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