I have this rash... and....?

IF you haven't tried any new food , used new laundry detergent or body soap/wash then I'd say that you have an environmental allergy more so. Something in your living surroundings could be causing it. Or if you haven't gotten any new clothes that you may have some sensitivity to the fabric I'd be sure to take a benadryl or apply benadryl lotion and see what relief this will give. That is temporary help though if the source of the problem is not discovered. It may take a trip to an allergist to know.