Ok, this hot spot stuff is all new too me. I'm not sure if that's what Boomer, who is 2 1/2 years old, has. I just noticed a dark hard scabby area within the last 4 days about the size of a half dollar on the top of his neck. I cleaned it, and sprayed peroxide on it and put some hydrocordizone 10 on it. It's not wet, but it is scabby. Not irritated, not red, not wet, not open. Just wondering if this is a hot spot? Also what causes these? I have an appointment with the vet on the 31st. It doesn't seem to be bothering him, and it is dry. Fingers crossed!