Originally Posted by WarChild

Hot spots usually develop as a result of a dog passing through it's "itch threshold". It is most often a problem on large dogs and caused by fleas or food alergies.

Food alergies, insect bites and fleas can lead to hot spots. In the case of my dogs, one is allergic to beef and too much will make him break out in hot spots.

What I am saying is you'll want to prevent further outbreaks. Feel free to contact me if you want, I have a lot of experience with this from rescue dogs.

In this specific case, you may need to use a collar like you suggested. Make sure it is clean and shave the hair in the area to keep the moisture from spreading the affected area.