, I've looked it up in lots of places and it always seems to relate to waxing/bleach etc, or hormone based, however my daughter is only 6 and doesn't wax
skin. This darkening occurs when an excess of melanin, the brown pigment that produces normal skin color, forms deposits in the skin.
I suggest you to get an evaluation done from a dermatologist. 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.