I recently had a breast reduction and have had a severe reaction in the form of a very itchy rash and hives that developed two days after surgery. It first showed up on my tummy and then spread. I took percocet and erithamycin, but have not taken anything for at least 10 days now. Could it be the anasthesia I'm having an allergic reaction to? The rash is still prevelant. It is under my arms, creases of elbows, tummy, and on my groin... I can't stand this and nothing seems to work. Help please.