Occasionally, the "herald patch" may occur in a hidden position (armpit, for example) and not be noticed immediately.

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。

The "herald" patch may also appear as a cluster of smaller oval spots, and be mistaken for acne.

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。