Vagina color isn’t the same as the rest of my skin! Why?

There’s a certain thing that’s been bugging me..

Surely I’m not the only one dealing with this but. Comparing my skin to the skin I have on my vagina it’s a bit darker. More so near the lips.

It couldn’t be because it’s dirty since I know that I wash regularly down there. What should I do? I honestly want to get rid of it. Is there anyone out there sharing the same problem.

Help a girl out?