If i have tried allegra (fexofenadine) for a minor rash which is worst now. it use to be from shoulder to feet in certain areas only. now its all over what can i do ?

Get checked out: I would go ahead and get seen today to seen what needs to be done next. Dont wait and let it get even worse.

See your doctor: If you have a rash that has worsened, you need to see a doctor to help determine the right diagnosis in order to obtain the right treatment. Rashes require that the doctor examine the skin to try to determine what is causing it. I would recommend an appointment with your doctor.