Dog Hot Spots: What They Look Like, Causes & How to Treat Them

Everything you need to know about hot spots on dogs — how to identify them, what causes them, home treatment options, and when you need a vet.

Published 2026-03-20

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Hot spot on a Labrador Retriever showing red moist oozing skin patch

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You're petting your dog and suddenly discover a red, moist, angry-looking patch of skin that wasn't there yesterday. Welcome to the world of hot spots — one of the most common and frustrating skin problems dogs get. Hot spots can appear seemingly overnight, spread rapidly, and drive your dog crazy with itching. Here's everything you need to know.

What Does a Hot Spot Look Like?

Hot spot on dog showing red, moist, oozing patch of inflamed skin
Hot spots are red, moist, and often oozing patches

A hot spot (officially called "acute moist dermatitis") is a patch of inflamed, infected skin. It usually looks like:

  • ✓A red, raw, moist patch of skin — often oozing or weeping
  • ✓Hair loss around the affected area
  • ✓Crusty or matted fur stuck to the skin
  • ✓A foul smell coming from the area
  • ✓Your dog obsessively licking, scratching, or chewing at one spot

Hot spots can range from a small coin-sized area to a large patch that covers a significant portion of your dog's body. They grow fast — what starts as a small irritated area in the morning can be the size of your palm by evening.

What Causes Hot Spots on Dogs?

Hot spots almost always start with something that makes your dog itch or irritates the skin. Your dog then licks, scratches, or chews at the area, damaging the skin and creating the perfect environment for bacteria. Common triggers include:

  • ✓Flea bites — even a single flea can trigger a hot spot in sensitive dogs
  • ✓Allergies — food allergies, environmental allergens (pollen, mold), or contact allergies
  • ✓Moisture trapped in the fur — after swimming, bathing, or getting rained on
  • ✓Ear infections — dogs scratch at their ears and create hot spots on the neck and face
  • ✓Matted or dirty fur — traps moisture and bacteria against the skin
  • ✓Insect bites or stings
  • ✓Stress or boredom — some dogs develop compulsive licking habits
  • ✓Underlying skin conditions — mange, dermatitis, or yeast infections

Certain breeds are more prone to hot spots, especially those with thick, dense coats. Golden Retrievers, Labradors, German Shepherds, and Saint Bernards are frequent sufferers, particularly in warm and humid weather.

Hot Spot vs. Other Skin Conditions

Hot spots can look similar to other skin problems. Here's how to tell them apart:

  • ✓Hot spots vs. ringworm — ringworm creates circular, crusty patches with a defined ring shape. Hot spots are more irregular and moist.
  • ✓Hot spots vs. mange — mange causes widespread hair loss and intense itching. Hot spots are usually localized to one area.
  • ✓Hot spots vs. flea allergy dermatitis — flea allergies cause itching mainly around the tail base and inner thighs, while hot spots can appear anywhere.

Not sure what you're looking at? Upload a photo to our AI skin disease checker — it can help distinguish between hot spots, dermatitis, ringworm, and other common skin conditions.

How to Treat Hot Spots at Home

Mild hot spots can sometimes be managed at home. Here's a step-by-step approach:

  • ✓1. Carefully clip the fur around the hot spot to expose it to air — this is essential for healing
  • ✓2. Clean the area gently with a mild antiseptic (diluted chlorhexidine or betadine)
  • ✓3. Pat dry completely — moisture makes hot spots worse
  • ✓4. Apply a vet-recommended topical spray or cream
  • ✓5. Prevent your dog from licking the area — use an e-collar (cone of shame)
  • ✓6. Keep the area clean and dry — check it twice daily

Important: do NOT apply hydrogen peroxide, alcohol, or tea tree oil directly on the hot spot. These can further irritate the skin and delay healing.

When to See a Vet for Hot Spots

Home treatment works for mild cases, but you should see your vet if:

  • ✓The hot spot is larger than a golf ball or spreading despite treatment
  • ✓Your dog is in significant pain or won't let you touch the area
  • ✓The area has a strong, foul odor (indicating deep infection)
  • ✓You see signs of swelling beneath the skin surface
  • ✓The hot spot hasn't improved after 2-3 days of home care
  • ✓Your dog gets recurring hot spots — this suggests an underlying cause that needs investigation

Your vet may prescribe oral antibiotics, anti-inflammatory medication, and investigate underlying causes like allergies or hormonal imbalances.

How to Prevent Hot Spots

  • ✓Keep your dog's coat clean, dry, and well-groomed — especially after swimming
  • ✓Use flea prevention year-round
  • ✓Address allergies with your vet (food trials, allergy testing)
  • ✓Dry your dog thoroughly after baths or swimming
  • ✓Check your dog's skin regularly, especially in warm weather
  • ✓Keep your dog mentally stimulated to prevent stress-related licking

Quick Check with AI

Spotted something on your dog's skin and not sure if it's a hot spot? Our AI skin disease checker can analyze a photo and help you identify the condition in seconds. It can detect hot spots, dermatitis, ringworm, mange, flea allergy dermatitis, and bacterial skin infections — giving you useful information to share with your vet.

Spotted Something on Your Dog's Skin?

Upload a clear photo and get an instant AI health report. Detect hot spots, dermatitis, ringworm, and more.

Start Skin Check →
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Disclaimer: This article is for informational purposes only and is not a substitute for professional veterinary advice. Always consult a licensed veterinarian for diagnosis and treatment of your pet's health conditions.

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Obese cat at BCS 8-9 on examination table showing the health consequences of feline obesity

Overweight Cat Life Expectancy: What the Research Actually Shows

Obese cats live shorter lives and suffer more during the years they do have. Here is what the research shows about feline obesity and lifespan — and what you can do about it.

Female Golden Retriever beside a row of six glass sample bottles showing pale yellow, medium yellow, amber, brown, pink, and cloudy urine shades

Female Dog Urine Color Chart: What Each Shade Means (with Pictures)

A female-specific guide to dog urine colors. Learn how heat cycle, UTIs, pregnancy, and life stage change what is normal — and which shades mean call the vet.