Pain in wrist

This is kind of weird but like in my gym class we are doing self defense and today we were practicing how to get out of a wrist grab. I had a couple friends try it on me and they all had a pretty strong grip on me. I’m also really weak and skinny so not only couldn’t I really break free but they could also grip tighter. Of course I had immediate pain and redness from the grips but it’s 9:45 now and I’m still having pain. There’s this purple and blue mark on the side of my wrist and I’m confused on what it is. I think it’s probably just a bruise but I don’t know bc I’ve never bruised there before.

Help??

Sorry the picture isn’t that good.