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Hot spots: the fast-moving skin wound

Short answerA hot spot is a patch of raw, wet, angry skin - usually red, moist, sometimes oozing or crusted - that a dog creates by chewing or scratching an itch. They can grow quickly, so same-day action matters: clip the fur around it if you safely can, clean gently, stop the chewing, and call your vet. They are genuinely painful - in a clinical study of dogs with this kind of acute moist dermatitis, every dog scored as painful, and anti-inflammatory treatment measurably eased that pain. Small, early spots on a calm dog can be managed at home with guidance; large, spreading or painful ones belong to the clinic.

Sources: Acta Veterinaria Scandinavica (open access) and ICADA guidelines, linked at the end.

What you're looking at

The clinical name is acute moist dermatitis, sometimes pyotraumatic dermatitis - "pyotraumatic" because the dog's own chewing and scratching do the damage. Something starts an itch (a flea bite, a burr, an allergy flare, a damp undercoat after swimming), the dog attacks the spot, and bacteria bloom in the broken skin - which itches more, so the dog chews more. The cycle is fast: a spot you checked at breakfast can double by dinner.

First aid at home (for a small, early spot, calm dog)

Clip the fur around and over the spot with clippers if you have them and your dog tolerates it - air needs to reach the skin, and fur hides the lesion's true size. Use blunt-nosed scissors only with great care; hot spots hurt, and even sweet dogs snap.
Clean gently with cool water or a vet-approved mild antiseptic wash, then pat dry. No hydrogen peroxide, no alcohol - both sting and damage tissue.
Stop the chewing. An e-collar or inflatable collar is not optional here; ten unguarded minutes can undo a day of healing.
Keep it dry. No swimming, no baths over the area.
Call your vet the same day for guidance on size, pain, and whether a visit or medication is needed.

Why hot spots deserve a vet visit

At the clinic, treatment is straightforward and relief is quick: the area is clipped and cleaned properly, and the vet treats the inflammation and any infection - often with a topical or a short course. The study linked below is a useful window: dogs with acute moist dermatitis improved fastest when treatment addressed both inflammation and bacteria. Just as important, the vet hunts for what started the itch. Pain with hot spots is real, so leave close work on anything bigger than a small early spot to the clinic team.

Preventing the next one

Hot spots love repeat customers: dogs with unmanaged allergies, gaps in flea control, dense or damp coats, or a habit of licking one spot. Dry your dog after swims and baths, keep flea control current, and treat the underlying itch - the causes guide and the itch diary exist for exactly that.

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