Labia minora thing??

Hi,

I recently had sex for the first time and went to really look at what goes on down there for the first time. I’m 19 and grew up in a Christian household so I never really looked at it.

Anyways, I noticed that one of my labia minora. The left lip is partially brown. I’d include a picture but it’s like very much on my genitals. Is that normal? It doesn’t hurt or anything. Me and my partner were each other’s first times so I don’t think it’s an std. please let me know! Thanks!