Getting used to new android, pics small etc so maybe missing something... Im unsure what peeling you mean. The hoof looks due for a trim & edges could be 'rolled' h which would stop the 'peeling' at bottom. Or do you mean the lighter area at the front top, below hairline? If top n just like skin, Id think its just waterlogged periople. If more than skin - hoof horn has actually ruptured there n cracked, id think an acute laminitis 'attack' recently. SopunDs like frogs n heels suffering from wet environ too. As horse is lame which may or may not be to do with the feet n peeling, good equine vet would be prudent.
PS annoys me a bit when ppl not check spelling n punctuation, use lost shorthand, but is difficult w this android sorry - hope I get thehhang soon!
Hmm, just had another look on my ol' trusty PC & can see it's not periople, or apparently abscess split. And noticed that you say he hasn't been standing in mud or such, so for a dry environment more puzzling - feet don't cope well with eternal wet/damp. I'd be thinking a fungal/bacterial infection too, &/or nutritional. Possibly selenium overdose or such??
No worries about the skin coming off at the top of the hoof. It's just the periople: It is a thin skin that covers where the coronary band and hoof wall join. It's just like the cuticle on your nails. In wet weather it swells up and turns whiter, and sometimes it peels off. You know how sometimes your cuticles peel off when they get extra soft? Same thing.
But the lameness and swelling is another issue. Your horse could have an abscess brewing, be fighting scratches that are hiding under the hair around the pastern, or some other issue. Your hoof has some bad flares on the sides so hopefully your farrier can address those too.