What are hot spots on dogs?
Hot spots, known clinically as pyotraumatic dermatitis, are acute, moist, inflamed skin lesions that appear suddenly and spread rapidly. They develop when a dog scratches, licks, or chews at an area of skin, breaking the surface and allowing bacteria to multiply in the warm, moist environment created by saliva and exudate.
The primary bacterial culprit is Staphylococcus pseudintermedius, according to multiple veterinary sources including the MSD Veterinary Manual. The lesions are typically red, swollen, painful, and may ooze or develop crusted scabs. Hair around the area often becomes wet and stuck down, and owners frequently notice a foul odor.
A 2004 prospective study of 44 dogs published in Veterinary Dermatology found that hot spots most commonly appear on the cheek, neck, and lateral thigh. The study also noted that males and dogs aged four years or younger were more frequently affected, though hot spots can occur in any dog at any time of year.
What are the symptoms of a hot spot?
Hot spots are usually obvious once they develop. The lesion is red, moist, and often oozing or crusted. The surrounding fur may be wet and stuck down, and the area is typically painful and itchy. Dogs will often lick, chew, or scratch the spot obsessively, which worsens the inflammation and spreads the lesion outward.
You may also notice hair loss around the lesion, localized swelling, and a distinct odor. Some dogs show signs of discomfort or pain when the area is touched, and in severe cases they may act irritable or lethargic.
If the lesion is larger than a couple of inches, spreading rapidly, or your dog seems systemically unwell, see your vet promptly.
How do you treat a hot spot on a dog?
Treatment centers on stopping the self-trauma, cleaning the lesion, controlling bacterial overgrowth, and addressing the underlying trigger. Veterinarians follow a consistent protocol supported by clinical evidence.
Clip the hair. The first step is to clip the hair around and over the lesion to expose the skin, allow air circulation, and make cleaning easier. This also stops wet fur from trapping moisture and bacteria.
Clean with chlorhexidine. The MSD Veterinary Manual recommends chlorhexidine at 2 to 4 percent concentration as the antiseptic of choice for surface pyoderma. Your vet may provide a chlorhexidine solution or wipes for daily cleaning. A 2024 randomized trial of 30 dogs published in Veterinary Medicine and Science found that chlorhexidine-based solutions were effective for managing superficial pyoderma when used consistently.
Block licking. An Elizabethan collar is essential. Self-trauma is what created the hot spot, and continued licking will slow recovery. Most dogs need to wear the collar until the lesion has closed over, typically three to seven days for mild cases.
Address the cause. Hot spots recur unless you identify and manage the underlying trigger. Common causes include flea allergies, food sensitivities, ear infections, anal gland impaction, insect bites, cuts, matted fur, or behavioral stress. Your vet will examine your dog for fleas, check the ears and anal glands, and may recommend an elimination diet trial or flea prevention if allergies are suspected.
Topical therapy is usually sufficient. According to the MSD Veterinary Manual, surface pyoderma like hot spots should be managed with topical antiseptics alone. Oral antibiotics are reserved for deep or extensive infections that do not respond to topical care.
How long does it take for a hot spot to improve?
Mild hot spots typically improve within three to seven days with proper treatment. More severe lesions may take seven to 14 days. Hair regrowth over the affected area takes an additional two to four weeks, according to multiple veterinary sources and the 2004 prospective study of 44 dogs.
You should see improvement within the first day or two. If the lesion continues to spread, or if new lesions appear, contact your vet.
Are there other treatment approaches being studied?
A 2025 case series published in the Journal of the American Veterinary Medical Association described eight dogs with hot spots managed using photobiomodulation with fluorescent light energy. All eight dogs improved without antibiotics or topical medications. The authors noted that the approach was well tolerated and may offer an alternative for cases where owners prefer to avoid medications, though the series was small and more research is needed.
What can reduce the risk of hot spots?
Keep your dog on year-round flea prevention, as flea allergy dermatitis is a common trigger. Regular grooming stops fur from becoming matted, especially in long-haired breeds. Address ear infections and anal gland issues promptly. If your dog is a chronic licker due to stress or boredom, increasing exercise, providing enrichment, or consulting a veterinary behaviorist may help.
Males and younger dogs may be at higher risk according to the 2004 study, but any dog can develop a hot spot if the right combination of triggers and self-trauma occurs.
When should I see a vet?
See your vet if the lesion is larger than a couple of inches, spreading rapidly, or not improving within a day or two of home care. Also see your vet if your dog has multiple hot spots, if the lesion appears deep or is oozing heavily, if your dog seems lethargic or has a fever, or if hot spots recur frequently. Your vet can identify the underlying cause, prescribe appropriate topical or oral medications if needed, and rule out deeper skin infections or other conditions that may resemble hot spots.
