If you have ever left for work with a dog that had a tiny red patch of skin, and come home to find a raw, weeping sore the size of a pancake, you have probably met a hot spot. Vets call it acute moist dermatitis or pyotraumatic dermatitis: a rapidly developing area of inflamed, infected skin caused when a dog scratches, licks, or chews one spot until the surface breaks down. Hot spots are painful, smell bad, and can double in size in a single day, but the good news is that they respond very well to treatment when caught early.
What Causes Hot Spots?
A hot spot always starts with something that made the skin itchy or broken in the first place. The dog’s own licking then traps moisture and bacteria under the coat, and the lesion expands. Common triggers include:
- Fleas and other parasites – the single most common underlying cause
- Allergies – to food, pollen, dust mites, or flea saliva
- Insect bites, cuts, and grazes
- Matted or wet fur – thick-coated breeds such as Golden Retrievers, German Shepherds, and Labradors are especially prone in hot, humid weather
- Ear infections, impacted anal glands, or arthritis pain – licking near these areas can create a sore
- Boredom or stress – some dogs lick themselves compulsively
Symptoms to Watch For
Hot spots are usually easy to spot once the hair is parted:
- A red, warm, moist patch of skin, often hairless in the center
- Sticky pus-like discharge that mats the surrounding fur
- A foul smell
- Intense licking, chewing, or scratching – sometimes with whimpering
- Rapid expansion of the sore over hours
When to See a Vet
Contact your vet as soon as you notice a hot spot. While you wait for the appointment, stop your dog from licking the area with an Elizabethan collar, a body suit, or even a t-shirt. Seek urgent care if the sore is near the eyes or ears, if there is pus or a strong odor, if multiple spots appear at once, or if the lesion keeps spreading despite your efforts. Hot spots are not usually life-threatening, but untreated deep skin infections can become serious and much more painful.
Common Vet-Directed Treatments
Veterinary treatment typically follows these steps:
- Clip and clean – the fur is shaved well beyond the visible edge of the sore so air can reach the skin. This is often done under sedation because the area is extremely painful. Never attack a hot spot with scissors at home; it is very easy to cut the skin.
- Antiseptic cleaning – the skin is disinfected, commonly with a chlorhexidine solution.
- Topical medication – antibiotic or antiseptic sprays and creams, often combined with a mild steroid to reduce inflammation and pain.
- Systemic medication – oral steroids or antihistamines for itching; a course of oral antibiotics for two weeks or more if the infection has spread into deeper skin layers.
- Treating the underlying cause – flea control, allergy management, ear treatment, or anal gland expression, so the hot spot does not simply come back.
Home Care While Healing
After the vet visit, your job is to keep the area clean, dry, and untouched. Clean gently as directed – many vets recommend diluted povidone-iodine or a prescribed rinse once or twice daily. Keep the cone or body suit on until the skin has sealed, and recheck the sore every day: within about 48 hours it should look quieter, with less redness and oozing. Scabbing and regrowth of normal skin usually take 7 to 10 days. If the area is still red or getting bigger after 48 hours of treatment, go back – odds are your dog has been licking it behind your back, or the underlying cause has not been addressed.
Prevention
Keep your dog on year-round flea prevention, dry the coat thoroughly after swimming or bathing, brush regularly to prevent mats, and check the skin weekly – especially in summer. Dogs with known allergies benefit from a vet-guided allergy plan, since controlling the itch is the surest way to prevent the next hot spot.
Disclaimer: This article is for educational content only and is not a substitute for professional veterinary advice. Always consult a qualified veterinarian regarding your pet’s health.