If it’s stopped bleeding then you’re probably fine. And they don’t like to do stitches if it can be avoided so my guess is they would glue it and apply a butterfly bandaid if you were to go in. Maybe even just a butterfly bandaid since it is no longer bleeding.
Doesn’t look deep enough for stitches but may leave a little scar. The red blood pool would be a deeper red if it needed stitches from my experience. Take him in maybe so they can glue it and prevent scarring. My son has had 2 black eyes and 3 busted lips from being crazy at the park, I feel ur pain.
It doesn't look to bad, but you go to the doc to make sure everything is OK. Maybe apply some ice to avoid swelling?