A friend had a bump that appeared, then disappeared, reappeared. This went on for several years. It looked sort of like a mole. Twice she went to a dermatologist, by the appointment, the bump disappeared. Nurse Practitioner said, "Next time it appears, don't wait for appointment, come right in. Call that morning and we'll fit you in." So she did call and they got her in the next day. The dermatologist finally saw it and said, "It is a group of tiny blood vessels that moves to the top sometimes, that's when you can see it. I can remove it right now, and should. These things can change." So right then, in the office, they gave her a Novocaine-type shot, removed the "bump/mole" before it could disappear again, and they were done in a few minutes. She wore a band-aide a couple of days because it bled a little, but not much. Not sure, but think it's called Pyogenic granulomas; raised mark caused by small blood vessels.