Question: About two months ago I strained my left pectoral muscle and there was inflammation where the pectoral muscle meets the armpit. It has been two months and have seen a doctor and he can't really feel any lumps, but when he presses on that region it is painful. It has been over two months and the swelling has gone down, but the pain is still there if you press on it and there is mild swelling.

Thank you for the information. The details of how the injury happened are as follows. At the beginning of Sept 2014 I lifted a heavy kyak quickly and felt a sharp burning feeling through my right pectoral muscle region, radiating from the armpit a down across my chest. For a few weeks it was very painful if I sat up in bed (sit up motion) and had noticeable swelling. I did not think much of it and continued to golf and play hockey with a few workout sessions mixed into my routine. When it did not seem to be getting better, I went to my family Doctor. The blood work and ultra sound came back normal. I stayed away from sports for the last 3 weeks and noticed improvement, but if you press just above the left nipple area close to the edge of my pectoral muscle (before the armpit) it is tender and sore, but this increases with activity and decreases if left alone.

My ultrasound came back negative, but it is very tender if pushed on the left side about and inch away from my nipple.
My concern is that my sister just battled breast cancer, and I am extra sensitive to the fact that this injury seems to be taking so long to heal.
I am going for an MRI, but is could be a few months before I get a date and I want to gain some re-assurance around why this seems to be an ongoing tender area.
Any insight would be much appreciated.