A pea-sized knot appeared on my perineum a few days ago and now it looks, and feels, like a blister. I assumed it was a hemorrhoid, since I ve never had one, but now it s painful & burns, almost like an open wound. I ve been treating it with witch hazel, tea tree oil, preparation H and coconut oil. I ve had the same partner for over 15 years and nothing like this has ever happened, not even while pregnant.