Discoloration Down There

When I look at my vagina with a mirror I notice that it is a different color then the rest of me. It’s a darker color all around while my legs are significantly lighter. Also it extends slightly to my inner thighs. I don’t know if it’s because I gained 15 pounds in 3 years? I’m 5’3 and 145. I feel like I’m not big enough for that to be the reason. Does anyone else have this ? How do I get rid of the color ?