TMI Photo. Bump on nipple? Advice anyone. 23 weeks pregnant.

Hi lovely ladies. I'm 24 and 23 weeks pregnant with twin boys. I have a doc appointment next week but just thought I'd ask on here. I've had this little bump for a little while on my nipple. I am not sure if I got it before pregnancy or I just didn't notice haha. I have been for a breast check 2 months ago just as standard and because I am quite the worry wart. Doesn't hurt as far as I know, its just there. Any ladies have similar? Is this just a random booby thing haha Excuse my baby bump!