I have this rash on the walls of my butt cheeks it burns and itches and bleeds mostly at night. I have had it for 7 weeks. I though it was herpes went and got a blood test and had a culter both came back negative so I got tested again to double check and both were negative so its not herpes but it won't go away I have found relief from epson salt and using witch hazel but they only relieve the pain and itch for a small amount of time. I need help