I have the dark patches under my arms and so does my sister. Haven't had it on my face. My understanding is it is related to PCOS through insulin resistance and interestingly mine faded whilst I was taking metformin (anti diabetic). Now that I have stopped its gotten darker again. Have you been tested for insulin resistance?
Yes, I am insulin resistant but had a lot of trouble with Metformin. That was years ago though, apparently there is a nicer version of it now - will get on to my doctor and get started. Hopefully it works!
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