Horse Veterinary Questions? Ask an Equine Vet.
Good Morning and welcome! I am Dr. Loretta, a licensed veterinarian and I am happy to answer your question.
This area that is swollen is a common area for fluid build up due to gravity caused by some trauma above. Since you have seen abrasions on your guys legs, there was most likely a trauma that has caused fluid to go to the lowest point which is this area. I would certainly make sure to clean the abrasions, make sure your guy has a tetanus vaccine and possibly antibiotics to be sure this does not turn into an infection. Watch this swollen area because it is also a common area for abscesses caused by fly bites. Since it is so cold there, this seems unlikely but worth keeping an eye on this. In most cases, this swelling will resolve on its own once the offending trauma has healed.
Does that make sense to you?
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You are very welcome, Krista...don't feel bad.This happens all the time and horses do well without treatment.