Thank you for writing to us.
Do you inadvertently tuck your underwear into your butt? If that is the case, then you may need to lose weight. This could be a cause.
I cannot explain other causes without a physical examination or a picture. Upload these and write the question again describing the problem in detail.
Wishing you the best of health.
These Q&A’s are for educational purposes and should not be relied upon as a substitute for medical advice you may receive from your physician. If you have a medical emergency, please call 911. These answers do not constitute or initiate a patient/doctor relationship.