Greetings. Pigmentation over the buttocks could be frictional or due to post inflammatory hyper pigmentation. Sometimes it may be a fungal infection causing blackening too. I feel it's important for you to see a qualified dermatologist and can see a female doctor if you are very shy. Hope this helps. Warm regards.
Flag this answer
Let others know if this answer was helpful
Was this answer helpful?
Disclaimer : The content is not intended to be a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of your physician or other qualified health provider with any questions you may have regarding your medical condition. Never disregard professional medical advice or delay in seeking it because of something you have read on this website.