He had came across you and tried to kill you. Not aware that you are Shōta Aizawa’s kid, which Aizawa is known for the hero title Eraserhead. Which Shigaraki succeeded to decay some of your skin off your arm and face.

When suddenly Shigaraki came to a halt, there was no reason… At least what you thought.

(You had Eraser like your father Shōta)