Hi John! Good evening. I am Dr Shareef answering your query. If I were your doctor, I after a proper clinical examination of your elbow and the chest, would apply a pressure bandage on the lump presuming that it could be a hematoma following the trauma which would gradually get absorbed. In addition, I would also prescribe you with an anti inflammatory and a proton pump inhibitor and a serratopeptidase product for a symptomatic relief. If the cough has lasted for over 10 days, this would be an indication of going for a x-ray chest PA view to rule out any gross pathology in the lungs. However, both need to be assessed by an orthopedic surgeon and your treating doctor for the lymphoma. Therefore, I would advise you to get assessed by these doctors in your place. I hope this information would help you in discussing with your family physician/treating doctor in further management of your problem. Please do not hesitate to ask in case of any further doubts. Thanks for choosing health care magic to clear doubts on your health problems. I wish you an early recovery. Dr Shareef.