As an STD assistant, I understand your concern about a rash in the genital area. Human papillomavirus (HPV) can sometimes cause warts or lesions around the anus or buttocks. However, a rash could also be caused by other conditions like skin irritation or infection. It's important to get any unusual symptoms checked by a healthcare professional for an accurate diagnosis and proper treatment. I suggest making an appointment with your doctor or visiting a sexual health clinic to have the rash examined. They can determine the cause and provide guidance on managing the condition. Please don't hesitate to seek medical advice, as your health and well-being are the top priorities.