Health & Diseases

Hot Spots in Dogs: Causes, Symptoms, and Quick Treatment

Hot Spot (acute moist dermatitis, pyotraumatic dermatitis) refers to a rapidly spreading, weeping skin inflammation caused by intense licking, scratching, or biting at a specific body area. Within hours, a small irritation can develop into a large, inflamed, weeping lesion.

Hot Spots in Dogs: Causes, Symptoms, and Quick Treatment

What is a hot spot in dogs?

A hot spot (acute moist dermatitis, pyotraumatic dermatitis) refers to a rapidly spreading, weeping skin inflammation caused by intense licking, scratching, or biting of a specific area of the body. Within hours, a small area of irritation can develop into a large, inflamed, weeping lesion.

Hot spots are not a disease in and of themselves—they are the result of an underlying condition that causes itching or pain in the affected area. Common causes include allergies, flea infestations, ear infections, anal sac issues, or muscle pain.

Background + Scientific Context

Holm et al. (2004, Veterinary Dermatology, PubMed 15030499) conducted a prospective study of 44 cases of pyotraumatic dermatitis: The most commonly affected body parts were the cheeks and temples (often in cases associated with otitis), the flanks, the thighs, and the base of the tail. Bacterial cultures predominantly revealed Staphylococcus pseudintermedius. Treatment with short-term corticosteroid administration to interrupt the itch-scratch cycle + antibiotics (systemic or topical) led to complete healing in most cases. Crucial: The underlying cause must be identified concurrently.

Marsella (2013, Veterinary Clinics of North America, PubMed 23137503) described the pathophysiology of canine pyoderma: The itch-scratch cycle is self-perpetuating—mechanical trauma to the skin increases the permeability of the skin barrier, facilitates bacterial colonization, and intensifies the local inflammatory response, which in turn causes itching. Interrupting this cycle (E-collar, cortisone) is the primary treatment principle.

Gross et al. (2005, *Skin Diseases of the Dog and Cat*, Blackwell) described the histological features: Hot spots present with superficial epidermitis accompanied by serous exudation and neutrophil infiltration. Deep pyoderma (extending into the hair follicles) is less common—when present, it requires more aggressive systemic antibiotic therapy.

Vitomalia-Position

A hot spot that is treated without addressing the underlying cause will return. Recurring hot spots in the same area of the body are not just bad luck—they are a diagnostic signal. Hot spot near the temple: examine the ear. Hot spot on the flank in summer: fleas and allergies. Hot spot at the base of the tail: anal glands.

When does a hot spot become a concern in dogs?

  • If you develop a sudden, weeping, red, hairless patch of skin that is rapidly spreading
  • In dogs with known atopy: Hot spots during an allergic flare-up
  • For long-haired breeds with thick coats (Golden Retrievers, St. Bernards, Newfoundlands): increased risk in the summer
  • After swimming: a damp coat beneath a thick undercoat — the perfect conditions
  • In cases of otitis: a hot spot near the temple as an indicator

Practical application

Emergency Measures for Hot Spots:

Step Action Goal
1 Shaving area (removing fur) Let the wound breathe
2 Gentle cleansing (chlorhexidine 0.05%) Remove exudate
3 Put on the E-collar Break the itch-scratch cycle
4 Topical or systemic corticosteroids (veterinarian) Reduce inflammation and itching
5 Antibiotics for secondary infections Systemic or topical, depending on the findings
6 Identify the root cause Recurrence prevention

Typical root causes based on hotspot localization: - Temple/cheek: Otitis externa - Flank/back: flea bite allergy (FAD), atopy - Tail base: anal sac issues, fleas - Hind leg/hip: Muscle pain, treatment for hip pain

Common Mistakes & Myths

  • "Treat with antiseptic and a bandage." Hot spots need air, not to be covered. Moisture buildup under the bandage makes the condition worse. A cortisone component (which breaks the itch-scratch cycle) is essential for treatment.
  • “Treat it once, problem solved.” Without addressing the root cause, the hot spot will return—often in the same spot—because the underlying problem (otitis, allergy) persists.
  • "Hot spots only occur in dogs with long hair." Dogs with short hair can also develop hot spots—especially if they have allergies or a flea infestation.

State of the Art in 2026

Topical sprays containing hydrocortisone and fusidic acid (or similar combinations) are recommended as the first-line treatment for superficial hot spots—they have minimal systemic effects and act quickly. Systemic antibiotics should be used only for deep pyoderma or when topical therapy is insufficient. Long-term: Allergy management (Oclacitinib, Lokivetmab, Ciclosporin) has been shown to reduce the frequency of hot spots in atopic dogs.

Frequently Asked Questions

How can I tell if my dog has a hot spot?

A sudden, weeping, red, hairless patch of skin—often moist, warm, and scabbed over. The dog licks, scratches, or bites at it intensely. It is clearly distinct from the surrounding healthy fur. It can spread rapidly within a few hours.

Can I treat a hot spot on my own?

Small, superficial hot spots: Shave the area, clean it gently, and put on an E-collar. If there is no improvement within 24–48 hours, see a veterinarian. For larger, deep, or rapidly growing hot spots, always see a veterinarian immediately—systemic antibiotics and corticosteroids are necessary.

Why does my dog keep getting hot spots?

Recurring hot spots are a sign of an untreated underlying cause: allergies (atopy, food allergies), otitis, flea infestation, or pain. Treating hot spots without identifying the underlying cause is merely symptom management. A dermatological evaluation by a veterinarian is recommended.

Related terms

Sources & Further Reading

  1. Holm, B. R., Rest, J. R., & Seewald, W. (2004). A prospective study of the clinical findings, treatment and histopathology of 44 cases of pyotraumatic dermatitis. Veterinary Dermatology, 15(6), 369–376. https://pubmed.ncbi.nlm.nih.gov/15030499/

  2. Marsella, R. (2013). Canine pyoderma. Veterinary Clinics of North America: Small Animal Practice, 43(1), 117–134. https://pubmed.ncbi.nlm.nih.gov/23137503/

  3. Gross, T. L., Ihrke, P. J., Walder, E. J., & Affolter, V. K. (2005). Skin Diseases of the Dog and Cat: Clinical and Histopathologic Diagnosis (2nd ed.). Blackwell Publishing. ISBN 9780632027682.

Wissenschaftliche Einordnung

Holm et al. (2004, Veterinary Dermatology, PubMed 15030499) prospectively investigated 44 cases of pyotraumatic dermatitis: The most commonly affected body sites were cheeks/temporal region (often in otitis-associated cases), flanks, thighs, and tail base. Bacterial cultures predominantly showed Staphylococcus pseudintermedius. Treatment with short-term corticosteroid administration to interrupt the itch-scratch cycle + antibiotic (systemic or topical) led to complete healing in most cases. Crucial: The underlying cause must be identified concurrently.

Marsella (2013, Veterinary Clinics of North America, PubMed 23137503) described the pathophysiology of canine pyoderma: The itch-scratch cycle is self-perpetuating — mechanical trauma to the skin increases skin barrier permeability, allows bacterial colonization, and enhances the local inflammatory response, which in turn causes itching. Interrupting the cycle (Elizabethan collar, cortisone) is the primary treatment principle.

Gross et al. (2005, Skin Diseases of the Dog and Cat, Blackwell) described histological features: Hot spots show superficial epidermitis with serous exudation and neutrophilic infiltration. Deep pyoderma (extending into hair follicles) is rarer — if present, more aggressive systemic antibiosis is necessary.