Hi....I Was Punched In The Head By My Ex Boyfriend

Hi....I was punched in the head by my ex boyfriend a year and half ago. I'm too embrassed to talk to a doctor. He hit me on the temple which caused a a large lump that eventually drained into my face. 2 weeks later and it was healed. However, ever since I've had a dent on my forehead above my eyebrow. What is that?