Hi; I'm a healthy seventeen year old girl (other than suffering from chronic tonsillitis)...
I've got a small but painful lump on the inside of my lip. It's not really visible, though it's got a slightly different colour to the rest of my lip. I'm sexually active, but always safe, and I'm fairly certain that my sexual partner is STD-free.
It's definitely not a cold sore.
Could it be due to malnutrition? Lately, I've been trying to stick to healthy eating habits, but I batted with EDNOS (with anorexic tendencies) for a long time.