What is this dark spot on my labia minora/side of my urethra?

The other night while I was shaving I noticed a dark spot on my labia minora (sort of), it was on the left side (my left) of my urethra. I immediately freaked out and went looking for it but couldn't find it because I was looking on the wrong part of my labia. However, I noticed it again yesterday (again while shaving) and this time located the spot and got a good look at it. It's a dark brown color and is fairly small... it's raised up the tiniest bit. I have no idea what it is! If it's a mole wouldn't I have noticed it before? After a Google search I saw stuff about vulvar cancer and Squamous Cell Carcinoma and now I am really scared! My grandma had vulvar cancer so I feel like there's a good possibility that's what it is. I'm a virgin so I know it isn't some kind of STI or sex-related problem. I don't know if this is at all related, but I've been having digestive problems a lot lately too and it's been weeks since I haven't had diarrhea when going 'number two!' I don't know if that has anything to do with the spot but I figured I should mention it just in case. I read that sometimes discoloration happens to women past menopause or to women of African/Asian descent, but I am nowhere near to menopause and I am 100% Caucasian. I told my mom about it and she shrugged me off and said it was just a mole and not to worry about it, but I'm not so sure. Please help, I'm only 17 and I'm really scared!

[igotswag]

there 's something wrong with you..vaginas are supposed to be pink.. You sound grosssss! -____-

[wtf_is_swag]

Igotswag; your a ****** dickhead. Go play in traffic u piece of ****.