My dog recently got a really bad bug bite on his leg.
It irritated him so much that he immediately started itching and scratching (and licking) it constantly. Later that same day, the spot on his leg became raw (and hairless).
Similar to a hot spot, it needed to be kept dry and covered for a few days in order to heal properly. Otherwise, my dog would’ve just kept licking it all the time and it wouldn’t ever have a chance to fully heal.