Biting on the Face?

Today Alec was bit for the 5th time on his face.  I think it's by the same kid.  It's starting to really piss me off because this vampire keeps leaving welts on Alec's face.

I know biting is common among toddlers when they can't communicate, but biting on the face?

Once he came home with a welt under his eye and teeth marks on his neck.

I'm thinking of having a talk with his teacher and the director because it keeps happening and I just think biting on the face is a sign of aggression.

Any advice?