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Hot spots in dogs: when skin suddenly becomes sore

A small itchy area can quickly become red, wet and painful. Early veterinary attention helps identify the cause and limit worsening inflammation.

Hot spots in dogs: when skin suddenly becomes sore

Why a little bit of scratching can quickly become a big problem

Yesterday everything was normal and today your dog suddenly has red, weeping or even open skin?

Then it could be a so-called hot spot.

Hot spots are one of the most common skin problems in dogs and often appear seemingly out of nowhere. Vets see these skin infections regularly, especially in the warm months.

The good news: The earlier a hot spot is identified, the easier it can usually be treated.

What is a Hot Spot?

A hot spot is a sudden, superficial skin inflammation.

Vets often speak of acute moist dermatitis.

Typical are:

One important feature:

A hot spot can grow significantly in size within a few hours.

  • reddened skin
  • weeping spots
  • matted fur
  • severe itching
  • Pain when touched

How does a hot spot develop?

It usually starts with itching or irritation.

The dog:

The repeated irritation damages that same area.

This damages the skin and allows bacteria to multiply.

A cycle is created:

Itching → licking → inflammation → more itching.

  • scratches
  • licks
  • nibbles
  • rubs

Typical symptoms

A hot spot is often noticeable through the following signs:

Many dogs hardly leave the affected area alone.

  • sudden bald spot
  • very red skin
  • damp or weeping surface
  • unpleasant smell
  • constant licking or nibbling
  • Pain sensitivity
  • matted fur

Where do hot spots occur most often?

Typical parts of the body are:

Particularly thick fur can promote the development.

  • Neck
  • cheek area
  • Chest
  • Back
  • Flanks
  • Thigh
  • base of the tail

Why hot spots occur more often in summer

Many dog owners notice hot spots, especially in the warm months.

There are several reasons for this:

Moisture beneath thick fur creates ideal conditions for skin irritation.

  • higher humidity
  • Swimming in lakes or rivers
  • denser summer fur
  • more parasite contact
  • increased allergy symptoms

Common causes of hot spots

A hot spot is usually not the actual cause, but rather the result of a problem.

Allergies

Allergies are one of the most common triggers.

These include, among others:

Itching often leads to constant licking and scratching.

  • Environmental allergies
  • Pollen allergies
  • House dust mites
  • Food allergies

Fleas and other parasites

Even a few flea bites can cause massive itching in sensitive dogs.

Other parasites can also cause skin irritation.

Moisture in the fur

Dogs are particularly affected:

If moisture stays on the skin for a long time, the risk increases.

  • with thick fur
  • with undercoat
  • who swim frequently

Minor injuries

Sometimes it's enough:

Any of these may be the starting point.

  • a scratch
  • an insect bite
  • an abrasion

Ear problems

Dogs with ear infections often develop hot spots around:

These are areas where dogs with sore ears scratch more.

  • cheeks
  • Neck
  • ear base

Why you shouldn't wait too long

Hot spots are one of those skin problems that can get worse very quickly.

A small skin irritation can turn into a widespread inflammation within a short period of time.

Therefore, the affected area should be evaluated by a vet as early as possible.

When to go to the vet?

A visit to the vet is particularly important if:

The actual cause should also be clarified.

  • weeping areas
  • severe pain
  • unpleasant smell
  • rapid spread
  • recurring hot spots

Can hot spots always come back?

Yes.

If the underlying cause persists, hot spots may reoccur.

That's why it's often not enough to just treat the skin area itself.

The more important question is:

Why did the dog develop such severe itching in the first place?

Coat care and skin checks are important

Regular checks help to detect changes early.

This is particularly important for:

The sooner changes are discovered, the better.

  • long-haired dogs
  • Dogs with a thick undercoat
  • allergy sufferers
  • Dogs with sensitive skin

Conclusion

Hot spots are one of the most common skin problems in dogs and can get significantly worse within a few hours.

Triggers are often itching, allergies, parasites, moisture or small skin injuries. The inflamed area of skin is often just the visible symptom of a deeper problem.

If you recognise skin changes early and have the cause clarified, you can save your dog a lot of discomfort.

PET42 Editorial Team

About the author

The PET42 editorial team combines nutritional knowledge, practical experience and current research to provide understandable feeding recommendations for dogs.

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