strange bump

Elizabeth
I have this strange singular flesh colored, sometimes slightly pink,  raised bump on my labia majora. It is not painful at all and I generally don't notice it as it gets covered by my pubic hair. It has been there for a few years (2 minimum) and I have no idea what caused it. When picked at it turns red but won't bleed. Any ideas as to what it is? 
Note: I am a virgin so I doubt it is an STI/STD