The lump is definitely in the soft part, surrounded by the baggy skin, it's quite far away from the knee, actually I would say it's close to this horny buttock (yeah I know tortoises don't have buttocks but I have no idea how to call this area).
The doctor examined the spot quite carefully with a magnifying glass because his first impression was that it might be a splinter. But he hasn't found anything.
He also said that he has no idea what to do in this case and that he feels he can't help me at this point.
If the puffiness remains despite chamomile soaks and the use of topical I will look for a different vet here or try to go to another city (Kasia - I know dr Maluta and dr Marciniak i Warsaw - my tort has been their patient several years ago).
I am wondering though why she keeps walking and climbing just as she used to with no difficulty if it all comes from sick joint... It is really not bothering her at all I've been touching this place many times and she's just perfectly ok with it.
Maluta is the one I would recommend - hip USG would makes sense, it would tell if its a lymph node or the joint - actually I have had ruptured knee joint capsule and it does not hurt as bad as it look. Wish Your Baby all the best