<s>[INST] I have small lump on trapezius muscle right about the meeting point of clavicle and sternum. I did have an episode in gym where during dumbbell shrugs i severely strained the muscle and had limited mobility in there for about a week. I have no other symptoms. 21 years old. No smoke or drink. The lump is somewhat tender to touch and can roll with my fingers. What could it be? [/INST] Hi, dearI have gone through your question. I can understand your concern. You may have some tendinitis or soft tissue mass.  You should wait for sometime. You should take anti inflammatory drugs.  If it doesn't respond to treatment then you should go for examination and if needed go for biopsy. Consult your doctor and take treatment accordingly. Hope I have answered your question, if you have doubt then I will be happy to answer. Thanks for using health care magic. Wish you a very good health. </s>