A hot spot refers to a specific area of skin that becomes infected and inflamed.
It results in constant licking or chewing, in fact most dogs simply cannot leave the area alone. It is often referred to by a couple of more technical names, one of which is moist dermatitis.
Dealing with Hot Spots on Dogs
If the area becomes infected, you should quickly visit your local veterinarian as it will be difficult for you to judge whether or not it is a superficial wound or something that has taken a much deeper hold.