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Are your elbow and shoulder movements painful? Is the point where lump was situated is tender (pain when you press on the point)?
Following are the possibilities;
A) This can be trigger point. The myofascial trigger points are formed in this area which on specific position become painful. These can occur due to an acute injury or by chronic strains. A myofascial trigger point is a hyperirritable point in skeletal muscle that is associated with a hypersensitive palpable nodule. Trigger points may develop after an initial injury to muscle fibers. This injury may include a noticeable traumatic event or repetitive microtrauma to the muscles. The trigger point causes pain and stress in the muscle or muscle fiber. Following treatment are advocated;
1) passive stretching of the affected muscle after application of sprayed vapocoolant to be the "single most effective treatment" for trigger point pain. 2) Physical therapy 3) Transcutaneous electrical stimulation (TENS) 4) Therapeutic Ultrasound; Iontophoresis, phonophoresis 5) Massage 6) Steroid shots at the point
B) A scar tissue in the subcutaneous or muscle tissues; with the injury there is a rupture of these tissues and healing forms scar tissue. As any scar tissue, the have less blood supply than the surrounding tissue and less elasticity also. So they remain tender and painful for almost a year, from the injury. Treatment is same as above.Please feel free for your follow up questions. Dr. Arun