I agree with Resdivemedic..... This happened to my Dad on a dive in Fiji. He has a wider face, the mask wasn't equalized, and it pushed against the outside corner of his eye... His eye looked exaclty they way you descibe yours. Took a couple days to go away, and in the mean time he switched to a wider mask, and he made sure to equalize it

Didn't turn out to be any big deal.... just a simple mistake that looked aweful.