Works like a charm if you get the wound before it gets bigger than a quarter. Before any treatment is begun, you need to see your own veterinarian for diagnosis to treat your specific problem. What follows is a general statement on hot spots and does not substitute for a veterinary visit. This is a really tough problem. If the area is very well healed now, great.
Dogs lick because of a physical or psychological reason.
Psychological include boredom, anxiety and habit. I advocate this for young dogs like yours. Also betadyne soaks have occaisionally worked. If it becomes obvious that it is behavioral, then changing the routine to decrease boredom or anxiety is very important. The anesthetic works only a short time, but it can break the itch cycle.