Suggest Treatment For Itchy Rashes On The Cheek

After laser treatment l had itching , rashes and swelling in my cheek and chin .l went to the doctor and he prescribed Flutibact twice daily for five days .Now five days over and its reduced , not totally gone .But today l applied AntiOx Vit C from Kaya immediately swelling came .So l wash this and apply Flutibact swelling and itching reduced .why it happen? What should l apply?