With all three problems, the culprit is bacteria.  Horses' feet by their very nature reside in dirt, mud, manure or a combination of all three! Once a horse's foot has been prepared by your farrier or veterinarian, you should keep it clean and away from bacteria.  That's why it's better to use a properly fitted medicine boot to contain the Banixx™ than to allow his foot back into a contaminated environment.