Hot Spots in Dogs: Causes, Treatment and Safe Care for Sore Skin
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By Dr Duncan Houston
A small damp patch under your dog's coat can reveal a surprisingly sore area of skin. Hot spots often appear suddenly, and continued scratching or licking can make them expand quickly.
Stopping the damage matters, but so does finding out why your dog started bothering that area. Repeatedly treating the visible sore without addressing the trigger can leave the problem unresolved.
Quick Answer
Hot spots, also called acute moist or pyotraumatic dermatitis, are inflamed skin lesions caused by licking, chewing or scratching. Contact your vet promptly for a new wet, painful or spreading lesion and prevent further self-trauma while arranging care. Treatment usually combines local skin care, itch or pain relief and management of the underlying cause; oral antibiotics are not automatically needed.
What a hot spot can look like
The skin may be red, moist, weeping or crusted, with nearby hair stuck together. The affected area can be larger than it first appears beneath the coat. Some dogs repeatedly turn towards it, rub their face or become distressed when touched.
A photograph cannot reliably distinguish a surface hot spot from a deeper infection, wound or other skin disease. Virginia Tech's veterinary dermatology guidance emphasises examining the skin for deeper disease because that changes treatment.
Why dogs develop hot spots
Fleas, flea allergy, environmental allergies and ear disease can start an itch-scratch cycle. Anal sac problems or pain may also prompt attention to a particular area. A sore beside the ear, for example, should prompt an ear check rather than assumptions about swimming alone.
Dense, tangled or persistently damp coats can make skin care more difficult. Cornell's overview discusses coat moisture and associated triggers, but moisture by itself does not explain every lesion. The damaging licking or scratching and its cause still need attention.
How quickly should you seek care?
| What you notice | What to do |
|---|---|
| A new small wet sore in an otherwise comfortable dog | Contact your vet promptly for assessment and safe interim instructions |
| Rapid spread, marked pain, pus, swelling or a lesion near the eye | Arrange same-day veterinary care |
| A sore plus marked lethargy, weakness, collapse or severe distress | Seek urgent veterinary care; do not assume this is a simple hot spot |
What you can safely do before the appointment
- Stop access to the lesion with a correctly fitted protective collar if your dog tolerates it. Check that it actually prevents licking or chewing.
- Keep your dog indoors in a comfortable environment and pause swimming.
- Photograph the area without repeatedly handling painful skin, and note when it began.
- Ask your vet whether gentle saline cleaning is suitable. Avoid scrubbing, and stop if handling causes pain.
- Bring details of parasite prevention, recent grooming and any products already applied.
Do not cut mats or hair close to inflamed skin with scissors. Pain can make even a normally gentle dog bite, and clipping may require professional handling or sedation. Avoid alcohol, peroxide, essential oils and unprescribed creams. Do not tightly cover the lesion with a homemade dressing.
What veterinary treatment involves
Your vet may clip around the lesion, clean it and examine a skin sample under the microscope. Antiseptic treatment and appropriate itch or pain control can interrupt the cycle. Current ISCAID canine pyoderma guidelines favour topical antimicrobial treatment for surface disease. Systemic antibiotics are reserved for situations where examination and test results justify them, including deeper infection.
Use the specific formulation, frequency and duration prescribed. A product safe on body skin may be unsuitable near eyes or inside ears. Arrange reassessment if the lesion spreads, becomes more painful or fails to improve as expected.
Preventing the next episode
Maintain a coat-care routine, dry dense areas after bathing and use an appropriate parasite-prevention plan. Investigate recurrent ear problems or ongoing itch rather than waiting for another sore. AAHA explains that persistent itching can involve parasites, allergy and secondary infection, sometimes requiring long-term management.
Common mistakes
- Waiting a fixed 48 hours while a painful lesion expands.
- Assuming every red patch is a hot spot.
- Using leftover antibiotics or a previous pet's cream.
- Allowing licking because saliva seems to clean the wound.
- Treating repeated sores without investigating ears, fleas or allergies.
Frequently asked questions
Are hot spots contagious?
The hot spot itself is generally not contagious, but an underlying parasite or a different skin disease may be. A diagnosis matters, particularly if other pets are itchy.
Will an inflatable collar work?
Only if it prevents access to that particular area. Some dogs can still reach a leg, hip or tail; ask about another design if protection fails.
How long does healing take?
It depends on depth, size, the trigger and whether further trauma is prevented. Follow the treatment and review plan rather than relying on a guaranteed number of days.
Prompt attention can make a hot spot much easier to manage. Protect the skin, relieve the discomfort and address the reason the problem began.
For help deciding how urgently a skin lesion needs examination, contact ASK A VET™. A rapidly worsening or very painful sore needs hands-on veterinary care.
