I don’t know what to do

I don't think anyone is going to ask about it, people get hurt everyday and have scratches and stuff and no one really pays attention. If someone asks, just say you were playing with a cat or something. If it really bothers you, you can hide it with band aids or long sleeves if you want, but I don't think it's necessary.

I'd rather try to fix the situation with your mother. First of all, I'd say that parents do lose their temper sometimes and she probably did not mean to tell you deserved it. Don't let this go, however. talk to her rationnally. Try to fix the problem that lead to this situation without fighting and without yelling at each other. Explain to her how you feel when she does things like that and talk to her about how you guys have to find another way to fix your disagreements.

Start writing anything just write