Is it possible for a 2 year old child to cause bruising to their own face. Finger sized in a circle shape matching on both cheeks from biting h on the?

Biting what?? It is quite common to get circular bruising marks from suction with a object like a bottle top or cup, etc. but it would be difficult for a 2 year old to cause bruising on their face by biting them selves. Bites by other children are common at this age, and usually will show the individual teeth marks.