Somethings on my boobs HELP

So I am freaking out because over my full Nipple is this hard crust kinda thing plus I keep getting like lumps or spots they just feel weird I have had this hardness round my nipple for like a year but it hasn’t covered the full nipple it’s like a crust and it WON’T COME OFF no matter what I do I’m 13 btw and I starting to get really worried