Post menstrual spotting is a difficult diagnosis. It often occurs for unknown reasons. However, if it lasts more than 3 cycles in a row, it would be a good idea to see a gynecologist even if you don't really want to. The reason is that post menstrual spotting can often be due to a cervical inflammation (cervicitis) or vaginal irritation. Those are quite treatable if diagnosed correctly. I don't know of any home remedies that would even come close to treating this other than to just do nothing and see if it goes away.
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