I have a lump to the back of my L shoulder about the size of a golf ball.  I have had this for about 1 month and have been off work due to the pain.  I am going for physio and the Ultrasound and x-rays are normal.  I can see and feel this lump and so can my doctor.  He is treating it for bursitis but could this be a tumour of some kind?  Would I need further testing to determine this by MRI or bone scan?
Hi, Dear,Thanks for the query to Chat Doctor. I studied your problem in depth and I understood your concerns. Cause and plan of Treatment-In my opinion on the given data, you seem to have Sebaceous Cyst/but could be bursitis -as it is there for 1 month.USG /CAT/MRI scan would fix its diagnosis.Don't guess more. I would advise ER Surgeon Consultation. Hope this would resolve your issues. Act fast. So keep cool and Consult your ER Surgeon, if need be, who would treat it accordingly. So don't build up wrong concepts and create more psychic complications in you which would increase risks and costs to you, but just ask a query to Chat Doctor and be comfortable to resolve your health issues. Welcome for any more query in this regard to Chat Doctor. Write good reviews and Click thanks if you feel satisfied with my advice. Have a Good Day. Chat Doctor. N.