I have a rash on my buttocks that wont go away?

May need antibiotics. Rashes are difficult to describe in words. If a person has recurrent pimples on places where regular acne doesn't occur, he likely has infection in skin glands and/or hair follicles. A primary care doctor or a dermatologist can look at the skin and make a diagnosis. The doctors can prescribe oral antibiotics or creams/ointments as needed. Sometimes the bacteria are resistant to antibiotics.