My equine vet suggested that they may clear without treatment but she preferred to speed it up with the cream. Possibly to help prevent the spread?Juvenile warts should disappear without treatment.
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How old is the horse? Has he been out with young stock? They look like juvenile papilloma but they are usually on the face and on horses under for years old.
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He's 13. Only ever been turned with my older horse. They literally just seemed to turn up overnight!