Hello,
It is common for the area around the vagina and buttocks to be dark and hyperpigmented. Nothing should be done. The mode of treatment varies from antibiotics, alpha- or beta-hydroxy acids,hydroquinone,tretinoin,isotretinoin,dermabrasion to laser treatment. But none of them are safe in this area.
It is very difficult to precisely confirm a diagnosis without examination and investigations and the answer is based on the medical information provided. For exact diagnosis, you are requested to consult your doctor. I sincerely hope that helps. Take care and please do keep me posted on how you are doing.
Thank you. I will consult to doctor. Actually some part of my body is dark and some area is so fair. So i was nervous what to do?