I have round bluish mark on my upper lip, probably midway from the top of my lip and inside my mouth. It is located on the right hand side of my mouth. It is beneath the skin, not raised, no blister etc. I noticed about a week ago, and nothing has come from it. I faintly remember biting my lip awhile back, but really cant be sure of that. Could this be just a bruise, or what else? Should i go to a dermatologist or just my pcp? Thanks for help.