Hello~How are you feeling now, is the lump still there. If so, you may have some muscle spasm occurring in that area, this will make the chest hurt to the touch and even without touching. Does the lump feel like a "mass" is it moveable?
I would have it checked first by your MD and if he says there is nothing wrong then see a massage therapist. If it is a muscle spasm, then possibly the therapist would help, they would probably gently work on that area until the spasm releases.
I hope you feel better soon.