<s>[INST] I recently noticed a painful lump on the joint closest to your hand on my middle finger. It s especially painful with pressure to the lump. I m guessing that the size is probably about 1/4 of an inch diameter. What could this be? Will it go away on its own or is it any cause for concern? [/INST] HI, Dear,Welcome to Chat Doctor. Based on the facts and data of your query, you Seem to be having -Ganglion / or could be rheumatoid nodule. Treatment-Consult orthoSurgeon-Get the X-ray / if need be CT of Handset Compresses/ and Infrared Heat therapyAnti-inflammatoryPainkillersIf no relief Rheumatologist opinion, who would do RA/CRP and would evaluate and would give needful treatment Ganglion on the hand on middle finger extensor tendons-Ganglion Excision by Endoscopic Laser Ablation of the Synovial Histiocytoma around the joint line and tendon near it. Other causes need to be ruled out by Second opinion from your doctor which would help you to plan treats in the future. Hope this would help you to resolve your sever anxiety. Welcome for any further query in this regard Will appreciate writing your feedback review comments, to help the needy patients like you at Chat Doctor. Good Day!!  Chat Doctor. S. Genl-CVTS </s>