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My Dog Has a Red, Weeping Hot Spot That Appeared Overnight

A 3-year-old Golden Retriever with an 8 cm weeping lesion on the neck. Acute moist dermatitis (hot spot) requires clipping, cleaning, and addressing the trigger.

8 min read2026-02-08
hot spotacute moist dermatitisdog skinpyotraumatic dermatitis
PetMed AI Veterinary TeamVerified

Reviewed by Licensed DVM Professionals

Evidence-BasedPeer-Reviewed SourcesLast updated: 2026-02-08
Case Presentation

Your 3-year-old Golden Retriever, Cooper, has a raw, weeping lesion on his neck. It appeared overnight—8 cm of red, moist, hairless skin. He won't stop scratching. It smells. What is this?

3 yr
Age
Golden Retriever
Breed
8 cm
Lesion Size
Overnight
Onset

🩺 Acute Moist Dermatitis (Hot Spot)

Pyotraumatic dermatitis is a self-inflicted lesion—itching or pain leads to licking/scratching, which creates a moist, infected wound. Triggers: allergies, fleas, ear infections, matting, moisture. The Dermatology AI offers image analysis. The Dermatology Specialist outlines treatment: Clip hair, clean with antiseptic, topical/oral antibiotics if infected. Address underlying cause. The Microscope AI helps interpret cytology for bacteria/yeast.

💊 Treatment

Clip hair around the lesion to allow air and topical access. Clean with chlorhexidine or similar. Topical antibiotic/steroid or oral antibiotics if cellulitis. Elizabethan collar to prevent self-trauma. Identify trigger—flea control, allergy management, ear treatment.

Use Dermatology AI, Dermatology Specialist, and Microscope AI for hot spot evaluation.


Key Takeaways
  • Hot spots = acute moist dermatitis—self-inflicted from itching.
  • Clip, clean, treat—hair clipping is essential.
  • E-collar prevents further self-trauma.
  • Find the trigger—allergies, fleas, ear infection.
  • Golden Retrievers are predisposed—often allergy-related.

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