I have a large, very red, almost perfectly circular rash under my right armpit that will not heal.I have tried cortisone cream, Nystatin cream, and zeosorb powder. It is painful, but not extremely painful. I have been having severe shortness of breath about the time I got this rash. I just recently had blood work done and was told that my B-12,iron, and hemoglobin are very low. Actually hemoglobin is borderline low.