You know, best thing really is to leave it alone for now. Perhaps you got a small abrasion from the hair situation or when you cleaned yourself. It's a sensitive area to begin with. And if you keep touching it, you risk transferring bacteria to it. If it feels hot or if you have a fever, then you may already have an infection there. But likely, it is just healing. Next it may begin to itch which is a common thing to happen as something heals. If this continues, go to the doctor and have them look. Ibuprofen has anti inflammatory properties that help reduce swelling and there is always ice. But keep your hands off the area as best you can and get it looked at if it continues.