Both my dog's hind legs have a swelling/growth in joint "knee." Size of large marble. Ever seen this?

I just noticed today that my dog's hind legs have this growth/swelling around the joint towards the "knee." She's active and doesn't flinch/whine when I touch it, but I'm concerned. 2yrs old. Searched for pics online but didn't see any. Wish I could post one so I can show her legs. Anyone seen this before? She does have bad allergies and is on Prednisone, Conofite Lotion for ears, Cephalexin for infection of skin, and Cortisone shot. She's crated when I'm not home so she doesn't rub her body and wears her halo as well. Tends to lick her stomach, paws, and back legs raw. Please help...!

Both my dog's hind legs have a swelling/growth in joint "knee." Size of large marble. Ever seen this?
Oh that's not good I would recommend you call your vet and see if he can take a look at the dog today just in case you never know what can happened and it better safe then sorry . I know that I'm not helping at all here but my best advice is taking the dog to the vet as soon as possible.
Reply:My boxer had one of these - it was a hystioma. Basically a non-cancerous tumor. We had to have it removed and sent to a pathologist to make sure though. It cost about $480.00.
Reply:here's an article I found for you.





Lipomas, Or Fatty Lumps, In Dogs





http://www.metpet.com/Reference/Dogs/Hea...
Reply:Is her crate and bed large enough? Quite often they can develop these lumps when they are cramped for space in their kennel or in there bed.