What's causing this?

muffinino

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My traditional cob last the hair on his hind cannons last week, it was coming off in clumps. But, no scabs, no wounds, no bleeding, no red skin, not painful at all, hair itself was fine and clean, hair underneath was already growing back. His feathers and front legs are mostly ok, but the feather/hair is coarse there compared to his cannons. He also has a small patch behind his right knee (skin is a bit pink, no hair loss).
I don't think it's mud fever, even though he's been in a muddy field, as it was snowing over the weekend before and the ground was hard, although it was bit muddy afterwards. He has had pig oil & sulphur applied, but no more than usual (every ten days/two weeks) and has had it applied for the last two years with no problems. Could be this, I suppose.
I don't think it's mites as there's been no stamping or general itchiness and it's only on his cannons & knee. But again, could be this.
The pony next to him has had lice but he doesn't have them in the usual places or anywhere else afaik.
The only other thing I can think of is we had an accident a month or so ago - I fell off hard & hurt myself, only started riding this weekend. He galloped flat out downhill, approx. 60 acres down a steep hill, had a sore back & left hamstring. He's been treated by the physio and is much better. I'm thinking it could be stress as he lost the hair in between his back legs, behind his sheath iykwim, twice before through stress after illness. But it was the same place twice before and in a different place now so I'm not sure. He may be a big lump but he's a sensitive soul underneath :p
He's now been treated for fungal infection/mites/lice and it seems fine with the hair growing back. I just wondered if anyone's horse has had this? I'll add pics asap :)
 
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Right, here are the pics. The patches looks a lot pinker in these than it does IRL, I think it's the camera quality and flash. As you can see, there's no residue, no sticky stuff, no scabs, nothing! Sorry some are sideways, I can't figure out how to flip them :/ Also, he hasn't got a deformed or swollen hock, it's just the angle of the camera.

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It sounds like equine cannon keratosis, if you do a search there will be plenty of info on treatment.

Thanks, I've not heard of that before. It does sound similar, especially as a few sites say it occurs in spring. The only thing is there's no crusting or scaliness, just clean, soft skin underneath. I'll have a bit of a poke around the net :)
 
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