What is this?

We are fans of the cleft chin, the bumface. Cleft chin, or bumchin, is an inheritable trait characterized by a crease or dimple on the chin. The cause of both are likely the same. It is thought to be a result of incomplete joining of the jaw bone during embryonic development. The cause of the cleft chin is not well known.

Regardless of the cause, we at bumface think the appearance is quite funny, and can often resemble the human buttocks. Check for yourself.