<s>[INST] I have a hard lump at the back and to the Left Of my neck at c 6 to c7 . My doctor has referred me for an ultrasound. I have had a normal exray with no evidence of abnormality. It flares up from time to time and causes nerve type pain and all my muscles around the area to spasm . I am having an ultrasound. I have had this for 2 years now. What are your thoughts in what it could be. Regards [/INST] Welcome to HCM. Most probably it is swelling in the subcutaneous fat. It is also known as hump. Sometimes it is painful. If possible upload a clinical picture of your neck and upper back. Usually local measures such as physiotherapy may help to relieve the pain. We need to see your posture and if you have protruding neck with abnormal spine curves. Is it painful? is it just looking bad? whats your concern pain or cosmesis? Thanks. </s>