when you take phentermine and you get a rash what can you use for the rash can i take benadril for the rash or should i go see a doctor or should i stop taken phentermine and see if my rash goes away? should i have this rash everyday or will it eventually go away on it's own the rash goes away on and off sometime i don't itch and other day i can't stand the itching of it what should i do?