all you guys should google: Trigger Points.. they are knots in muscles and they should be treated. They happen to form cause of wrong form,while walking working and doing other stuff. I have one on my left pectoralis major muscle,far from the nipple, close to the shoulde. I have noticed it yesterday before I go to bed, when you touch there there is pain. It is hard and like thickened rope on the fiber.I scared the s..t. But it is not a soft lump it is not a growth or anything. I am workimg out hard and with poor form and heavy weigts so thats a clue to follow and I have diagnosed the lump by touching feeling etc that it is a muscle trigger point.. Then masaaged painfully and deeply with my fingers to soften it, about ten minuteshuge pain and it radiated, also I have found similiar hard tissue knots on outer sides of my pectoralis major muscle. I went to bed when it is too much pain to bear to keep massaging, slept, and now I have woken, the pain is lighter and in a larger area.. But the lump is not that big anymore.. Muscle is more relieved.. I now know that these nasty trigger points are already formed on my kneck muscles, trapezious muscle and back muscles.. I only happen to learn about them yesterday when one became too big and became painfull. I will now try to eliminate all of them from my skeletal muscles. I advice you to go tell your doc about trigger points and ask for the treatment if he agrees the diagnose.