HARD LUMPS ON BACK LEGS?? *sigh* cougars in the wars again..

Hey guys!

I have just come back from a 3 day Showjumping/Eventing school with Grant Paddison and John Golchert. Anyway I took our three horses (even though Billy got stuck in the stable all day eating grassy hay :roll: fatty lol) and Annie (eldest daughter) is training Cougar. When she finished hosing him down she noticed inlarged hard bumps on his back legs. They arnt sore to touch, and he isnt lame whatsoever on them... they just look weird.
He didnt hit any fences that lesson, and he hadnt been worked for a week before hand.
He has always had smallish lumps, but I think they have got bigger. Im not sure, but I don't think there are any tendons running along the front.
I mean we had a Vet check when we brought him, and he said Cougar has a very nice structure to be able to handle some height in jumping.

I just don't know...what do you guys think?? Any help would be so good! :)

Ok here are some pictures:

HMM well if its not effecting him, whats the problem?

Gosh DW haven't a clue did they go away after awhile or are they still there?
My only thoughts are possible bug bites or allergic reaction to something.

My first thought is "bucked shins".

http://www.thehorse.com/ViewArticle.aspx?ID=4066
http://www.horseadvice.com/horse/messages/4/5355.html

Ryle, he isnt lame, and he isnt at all sore when you touch them.

Vida- There has always been a lump there, Im pretty sure it has gotten bigger though. I don't think it would be a allergic reaction, I think it would have something to do with the bone. But im no Vet.

Thanks guys. Does anyone else have a idea?

Bone spur?

It could be an old splint (those don't cause soreness, lameness or anything they just look goofy) but those are always in the front I thought...

Thanks Abby.

This concerns me as Cougar was only broken in at 3, left in a paddock till we brought him at 4 (almost 5, you could say 5), and now one year and a bit, we are starting to train him.

If he has 'bone spur' what should I do?

Its not bone spur!

Did he hit his legs on anything? I would ice it and then put hot water, can't remember the order though. I'm pretty sure it's hot then cold but talk to your vet, it may be an abcess?

I have no idea. My mom said bone spur but I thought those were on joints?

It could be a splint if you just started working him a lot recently and he was overworked in comparison to how he is normally worked.