u/Alternative-Map2175

i have this scar for about 4 years now from a mosquito bite and after the bite i scratched and and became a scar, and after a few days i thought it healed already but when i scratched the old tissue it starts to become a new scar like when you scratch or cut your skin and it would regrow back to that black scar, and it spews blood like alot on the new scar on the left, and the most concerning is its spreading and i would hope that can someone tell me what is this and what can i do to remove it or treat it cuz its kinda embarrassing i have this in my legs,