<s>[INST] i have a medium to large soft lump near my ankle...I went to the ER, had it xray'd and showed nothing...I followed up with my pcp and he also blew it off but I am deeply concerned...It feels like a cotton ball is under my skin...i doesn't seem to hurt but I have been rubbing it so now it seem to be minor painful...What could this be...help. [/INST] Hi.Thanks for your query.Noted the history of a soft cotton ball like lump near your ankle and the X-ray at ER and an opinion of your PCP is negative.I can understand what you mean by. To me this looks to be a case of synovial thickening on the joint and hence missed till now. I would advise you the following:Get an MRI of the area done.Then get an FNAC and an opinion of an Orthopedic Surgeon.This will give you the most proper diagnosis and a chance to get a proper treatment. </s>