Last week I noticed discoloration around the right side of my mouth. It appeared suddenly. Saw my dermatologist immediately and she reassured me it was nothing probably just a bruise and would go away within a few days, which it did. This morning I was putting on make-up and my face was fine-finished a few minutes later and the bruising was back now on the left side of my mouth. Didn't bump into anything just like that it developed. What's going on? Thanks for your help