What Causes Indentation Under Right Eye After Slight Rubbing?

A while ago I rubbed just below my right eye with my finger. I felt a slight sensation of what felt like muscles or tissue moving under my skin between the cheek bone. The Next morning I found a indentation just under my right eye, below the tear duct where the nose and the eye meet, as if tissue is pushed in, it now casts a deep shadow. small pain and bruising, the left eye is perfectly fine. can anyone tell how this happened? it isn t subsiding