I'm a dental hygienist, and a dentigerous cyst normally occurs in the mouth and is associated with an unerupted or erupting tooth. For instance, we commonly see third molars with these cysts. I don't believe that they occur anywhere else, even the prefix "dent" means tooth. It sounds like an common abscess caused by some foreign material/bacteria stuck under the skin. As the wound trys to heal over, the bacteria is trapped and causes the body to create pus as a way to self-cleanse. I would keep draining it, use peroxide and maybe even some systemic antibiotics. By the way, my barn cat had a huge abscess of this manner, on his neck. It got to the point where I could not drain it and had to take him to the animal ER to have it drained. The vet placed a drain in his neck to keep the wound from healing too fast and prescribed him antibiotics. Watch the swelling, because it can accumulate very quickly and cause the animal to act lethargic and stop eating.
Last edited by Seahorseys; 01-16-2010 at 07:04 PM.