I was benching and my left chest tightened up I stopped doin chest and the next day I can feel like lump on the outside of my chest. I wait a few days and it wasnt better so I go to the doctor and he says I have a hematoma. But I read up on hematomas and I do not have those symptoms. My doc has a history of being wrong. I am gonna get a MRI and ultrasound tomorrow. My question is could it be some kind of knot that hasn't loosened up yet or tendon swelling??