Why does my nipple wrinkle and sting??

I’ll be laying down completely fine, when all of a sudden my nipples get really hard, wrinkle up, and sting so badly! I’ll obviously see a doctor if need be, but I’m wondering first, if this is normal to anyone? This is what it looks like. I’m so so so sorry for the graphic picture lol, but I need a very good opinion.

[Photo Removed by Glow]