I know this is a symptom/side effect of PCOS. My sister has it pretty bad in her armpits, they're almost as dark as her Mauritian husband! I'm just wondering if anyone else has this, and particularly if anyone has the patches on their face?

I'm asking because I've just noticed today that both of my eyelids are dark and looking very rough/dry, but they feel normal when I touch them. I've upped my water intake, as it's been pretty shocking lately, so thought it might be a dehydration problem. I'm hoping it's not PCOS, because it's pretty damn visible, and not something I can remove like my man-beard!