My mother was on the antibiotic Bactrim/Septra and has developed an extensive body rash. She stopped taking it immediately two days ago, but the rash is still there. It is on her neck, torso and part of her face, and looks like red patches. What should she do to get rid of the rash, or will it go away on it s own since she stopped the antibiotic? She has no fever, chills or swelling, just a nasty rash. Thanks