I have many red bumps at the back of my right thigh since two weeks ago, about 50 of them by now I think. They are itchy. Old ones seem to be healing after a few days since they are no longer itchy, and the surrounding skin becomes dark red or purple. But every day a few new ones appear. It's getting worse. These two days another two appeared on the left thigh as well. I've seen two doctors, and they gave me some cream and Terizin, but they don't really help. May I know what is wrong?