Discolored Vagina.?

I have a question for someone in the medical field that knows a lot about vaginas. Last night I was popping a pimple on my ass funny enough and I didn’t have any underwear on when I was doing it. I took my mirror and put it on the ground so I could see better. I was looking closely at my vagina, ya know, admiring my own pussy. I then closely look at it and I see that my clitoral hood was starting to turn gray. Only on the bottom halves. I am not sexually active at all. Virgin forever 💀 Hell I haven’t even kissed anyone in three years! I asked my mom about it and she is a nurse and she doesn’t even know what it is. I looked online to see if I could find any pictures but I could not find anything. Can someone please help me because I’m really worried!!!