Bubble on outer anus

It is about the size of a pea. It is about the size of a pea and looks almost blue or black in colour. Most of these haematomas do not need any treatment. It raises a pea-sized swelling right on the margin of the opening of the anus.

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It is very tender at first, because the skin is stretched over it in this very sensitive region, and when it is further stretched by passing a stool, it is even worse. Answers to specific problems may not apply to everyone. This is sort of an embarrassing question.