I have a subtle bump in my cheek at the corner of my mouth. it has a lot of purple veins around that area only. why is that?

Lesion in mouth: Hello, It is somewhat difficult to answer this question without a picture but sounds like your a describing a venous lake. This is a benign vascular lesions. Other thoughts include a traumatic lesion (i.e. from biting the inside of the mouth) creating a pocket of trapped blood or a mole. Prob best to have it evaluated. Good luck. Dr. Kosari.