Unfortunately, he licked that spot repeatedly until the area became raw and hairless — much like a hot spot.
Fortunately, I caught it before it had become oozy and infected. But it was clear that I had to do something to keep him from licking it, or it would become worse.
I had an old-fashioned e-collar for dogs stashed away in the closet from his post-surgery days several years ago. It still fit, but it was so big and clunky that it was awkward for him to eat, drink, lie down, and go outside with ease.