Which type of provider should I see to treat unilateral bruise / lump under left eye? (photos)

About 5 months ago I randomly noticed a bruise / small swelling under my left eye. I thought it was just from being tired but it never went away. It not sinuses issues, I have tried antibiotics and today I had an ultrasound which showed no lump or mass or fluid. Hard to catch in a photo but hopefully these help. It does get bigger when my face is tired and puffy but it’s relative. When I’m well rested it’s still there. GP is unsure. Should I see a plastic surgeon or a dermatologist. Any ideas??