My husband has been getting a rash under his arm pit(s) sometimes under one arm and sometime under both that are like dark red dots and they kinda hurt when you press them, they do not itch and nothing comes out of them and there is no odor. They appeared this summer. He is 50 yrs. old. His dr. gave him an antibiotic, we have used cortisone, athlete s foot by equate that the pharmacist recommended. They do not stay, they come and go. He has switched soaps and deoderants. He always wears sleeveless shirts. He has used numbchucks in the past and was wondering if maybe he damaged his sweat glands? Thank you for your help.