Have rash x3 weeks doc said it was allergy to take meds have been and it just keeps spreading and isn't going away. pics in profile tried cortisone too.?

Need to see picture.: This could be eczema, a drug rash, or hives depending on the nature of the rash. I am unable to access your pic. If it continues despite antihistamines and cortisone it very possibly is due to a medication or supplement you are taking, or nsaids (aspirin, ibuprofen, naprosyn, (naproxen) etc). Please ask for a referral for consultation with a board certified allergist, especially if the rash lasts 6 weeks.

See a dermatologisr: See a dermatologist . You may need a biopsy of the lesion if he or she cannot diagnose it.