Thanks for your replies.
Clive - The lump is in the fleshy part of the back of my arm half way down between my elbow and armpit. The lump is hard. I do get pains in both shoulders and put this down to RA.
I need to speak to my GP again as it is not getting any better and it is still painful after taking Tramadol. I do have private medical insurance so could easily get a scan. Just need to find the energy to visit GP yet again - I was only there last week and I always leave saying "see you soon"

as he is now learning the perils of RA. I am the only person in our practice who has RA and I am teaching our GP's about RA.
Thanks for your suggestion.
Jackie