What the heck is this?!

I’ve had like this weird bump on one of the outer lips of my kitty closer to my inner thigh and I never really gave it any attention but I’m so curious to what it is because it’s just weird I can’t really post a picture but idk what to do about it. It doesn’t hurt unless I apply some pressure to it and I think it got bigger? It’s been there for as long as I can remember but I’m personally weirded out now. Should I be worried or anything? I know it’s not like an std though