Do you also have any of that darkening on the inside of your thighs? Are your periods irregular? Do you struggle with your weight? (ALL of these questions are related to your question).
And howdy from up in "da Bronx"!
Yes to all my questions?
The most important issue here is dealing with the CAUSE of this darkening. In all likelihood you have a condition called "acathosis nigricans". Here is a link that describes this:
In all likelihood, in your case, this is related to PCOS:
Please click ACCEPT.
Feel free to ask a follow-up question.
ANd a BONUS is always appreciated.