Hello, I am currently taking 600mg of Clindamycin every 6 hours, and oxycodone 5-325 every 4 hours for a mastectomy on 2/6/14. I currently have an itchy rash on my chest, back, buttocks and scalp.. It sounds like an allergic reaction, it started 2 days ago (one week after starting both meds). Do you think its most likely a reaction to the Clindamycin or the Percocet? (I am allergic to Penicillen).