Friends horse has had a few bouts of cellulitis over the years, all resolved with usual treatment within a week to ten days.
Current one is now in week five, vet has been brilliant, targeted anti-biotic, steroids, diuretics, pain relief.
Owner is dedicated, hosing, ice boots, walking every 2...
And this is why novice owners should not try to produce young horses themselves, a correctly handled youngster should not try to bite or kick you, and if started correctly will not rear and buck