Yes, I have this too. Anywhere on my body that seems to have the most body heat, under the arms, brests, upper-inner thigh. I am lucky that mine is very light, not too noticable. I do not know what I would do for it. I have a big group of freckles in the same dark areas, too. I am glad to read your post, now I at least know what it is. It is nice to read what all of you wright and to know that I am not alone. Sometimes I feel so hopeless about the whole PCOS and obesity deal that I could just break down. All of you sharing helps so much, thanks.