Suggest Treatment For Skin Rash While On Contraceptive Pills

Hi, may I answer your health queries right now ? Please type your query here...hi there i am currently taking cetirizine for an allergic reaction, have been for 7 days. will this affect the contraceptive pill? i am takin microgynon, also my rash still hasnt disappeared after finishing my course of antihistamines, what will get rid of it thanks leah