I am trying to figure out what kind of rash I have. It's seems to be in my pores, once you start itching you don't wanna stop. Welts up. When heals, pores get I'd say a scab on em. Located on chest like upper side bra area. It's been there for months. It heals then gets worse. It doesn't spread just on one spot on body. Lil bit bigger than a half dollar. It's driving me nuts. Can you help me figure out what this is?