
moist dermatitis
The initial cause may be an insect bite a scratch, then if there is dampness and warmth it allow either bacterial or fungal infection. there is a cycle of self trauma and the body reacting with an inflammatory response and the area oozes. Yuk.
I have them just appear in humid hot weather, whether there was any insect involvement I couldn't say but they have occurred at the time when fleas are most plentiful, though none have been found on the dog.
I have also had them occur when another dog has grabbed at it's fellow in over rough play and obviously caused a small wound, which has turned into a hot spot.
With my bred I am always desperate to limit hairloss, as it can take until the next moult to grow back the same colour, not good if your showing and the dog looks moth eaten.
Barbara and the Grey Curly Tails.