Dog Hot Spots: Causes, Treatment & Prevention

Your dog was fine yesterday. Today, there's a raw, oozing, red patch of skin that seems to have appeared out of nowhere. It's probably a hot spot — one of the most common canine skin emergencies. Here is what to do.

What Is a Hot Spot?

Acute moist dermatitis — a localized area of skin inflammation and infection caused by a dog licking, chewing, or scratching one spot obsessively. The skin becomes red, raw, oozing, and painful within hours. Hair loss in the area. A foul odor from the bacterial infection. Most common on the head, neck, hips, and limbs.

What Causes Hot Spots?

Anything that makes the dog itch or lick one area: allergies (environmental or food), flea bites (flea allergy dermatitis is a classic trigger), ear infections (dog scratches ear, creates hot spot on cheek/neck), anal gland problems (dog licks rear, creates hot spot near tail), wet fur (swimming, bathing, rain — moisture trapped against skin), boredom or stress (psychogenic licking), matted fur, insect bites or stings.

Home Treatment for Small Hot Spots

Step 1: Clip the hair around the hot spot. You need to see the full extent and let air reach it. Go wider than you think.

Step 2: Clean gently with a mild antiseptic (dilute chlorhexidine or povidone-iodine). Pat dry — don't rub.

Step 3: Apply a veterinary hot spot spray or hydrocortisone cream (check with vet first).

Step 4: Prevent licking. E-collar (cone), inflatable collar, or T-shirt covering the area. This is the MOST important step — the hot spot won't heal if the dog keeps licking it.

Step 5: Identify the underlying cause. If you don't fix WHY the dog started licking, it will come back.

When to See a Vet

Large hot spots (>2 inches across), multiple hot spots, hot spots that don't improve in 2-3 days, hot spots with thick pus or foul odor, dog is painful or lethargic, recurrent hot spots.

Vet treatment may include: clipping and cleaning under sedation, prescription topical or oral antibiotics, steroids for severe inflammation, allergy testing, and addressing the underlying cause.

Prevention

Year-round flea prevention, manage allergies (food trial or allergy testing), dry thoroughly after swimming/bathing, regular grooming to prevent matting, address ear infections promptly, mental stimulation to prevent boredom licking.