As an STD assistant, I understand your concern about the recurring rash on your butt. A raised rash or sore in the genital or anal area could potentially be a sign of an STD like herpes or syphilis. However, it's difficult to diagnose the cause without a proper medical examination. I would kindly suggest consulting a healthcare professional, such as a dermatologist or an STD clinic, for an accurate diagnosis and appropriate treatment. They can examine the rash, run tests if necessary, and provide you with the best course of action. In the meantime, try to avoid scratching or irritating the area further. Remember, seeking prompt medical attention is crucial for your well-being. Please don't hesitate to reach out for support and care during this process.