Hello Edie,
This is a great question, and a condition I see a great deal in my general private practice.
A hot spot is the common term used for a skin condition called pyoderma. (Our fancy way of saying inflamed skin). It can be either a superficial pyoderma or a deep pyoderma, referring to the amount of skin depth affected.
There can be many causes to this dermatological condition. In general I see an itchy condition that has turned into a self-traumatizing big giant ‘boo-boo’. The dog (it can happen to cats too, but I see in more commonly in dogs) gets an itch, from either a flea, a bug, a parasite, an allergy, or some other impetus to cause the dog to start scratching. We all know how hard it is to stop scratching when the itch persists. Sometimes the scratching is so soothing that we keep scratching thereby making the small itch into a big pyoderma.
I most commonly see hot spots around the face of long haired larger breed dogs. I especially see them in dogs with recurrent or chronic allergies including ear infections.
If you see your pet licking or scratching a particular spot please investigate it. Most owners may see a small red spot at the base of the hair, or a moist area in the hair coat, but don’t think it is much of a concern until we examine it in the vet hospital and shave the overlying hair off. In almost all cases what appears to look like a tiny red spot ends up being a very large very red, very raw, area of skin. I tell people that a hot spot looks like rug burn, or road burn on us. Abrasions to the skin that then cause the skin to become inflamed and oozing of serum that makes the red inflamed skin sticky.
I included a very good article to help you with a good overall description of this condition.
If you think that your dog has a hot spot I would recommend seeing your veterinarian as soon as possible to start treating it. The hope is that we can significantly reduce and eliminate the pain, itching, swelling, discomfort and infection before the easier to treat superficial pyoderma turns into the much harder to treat deep pyoderma.
I hope that this helps.
If you need any other assistance or think that your dog has a hot spot I can be reached at the clinic anytime to see you and you pet.
http://vetmedicine.about.com/cs/dogdiseasesh/a/hotspots.htm
Sincerely,
Krista Magnifico, DVM
Owner Jarrettsville Veterinary Center
Jarrettsville, MD
http://www.jarrettsvillevet.com
Hi Beth,
there is a number of conditions that can cause hair loss. Little patches would make me think infection but you say your vet ruled that out? (both bacterial and fungal?) Gland/hormonal disorders can also cause hair loss but typically not in this type of pattern.
http://www.peteducation.com/article.cfm?c=2+2111&aid=421
Age by itself is not a disease, but with age things might not be working as well as they used to. There still should be a discernible cause, though, IMO.
Is this issue in any way seasonal?
Makes me think of Jasmine, though. Twice she developed a bald patch in different areas, which didn’t seem to have any reason for it. For lack of any better explanation, her vet put her on Melatonin and the fur grew right back.
http://dawgbusiness.blogspot.com