I noticed about 6 moles on the lips of my vaginal area, they are kinda flat but slightly darker than my skin color. I'm 16 and i've never had sex or engaged in anything sexual related. I also noticed the same type of mole on my lower back and a smaller one on my face. The first time i started noticing them was 6th grade i'm now in 11th. Is this normal? What could be causing this? Please help.