I have but have put him a joint supplement and his hocks and fetlock got real puffy. Do you think this be the cause? I can't ride due to a fractured shoulder. This just came about with the supplements I have been given for the past two weeks.
I agree with Ryan. A vet consult would be the best choice.
Get a vet to check it out- we can't tell without seeing the horse in person, or at least pics and videos. Could be a variety of things.