Emergency Appeal

As a charity, we need your support more than ever. Your donations will help our vets provide life-saving care at this time of crisis.

Dermatitis (red, inflamed, sore skin or a rash) in cats

black cat on white background


Has your cat got red, inflamed or angry looking skin? Do they have a rash? We often call these symptoms ‘dermatitis’.

Skin problems can be very irritating and painful and can be caused by many different things.

Dermatitis should always be checked by a vet, it’s often something that can be easily treated but could be a sign of something more serious.

Symptoms to look out for

photo of a rash on a cat's skin

Skin problems in cats often cause a crusty rash


Fleas and other parasites

  • Fleas are a common problem in cats. They cause itchy, red, skin rashes, especially around the lower back, neck and head.
  • Ringworm is a fungus which causes circular patches of red, raised, hairless, itchy skin. Fortunately, ringworm is quite rare in cats.
  • Other parasites – for example mites, lice and ticks often cause irritating skin problems.


  • Allergic skin disease causes itchy skin and rashes.
  • Food allergies often cause a rash and itchy skin.
  • Severe allergic reactions can cause hives, rashes and swellings anywhere on the body. Contact your vet ASAP if you suspect your cat is having a severe allergic reaction – this is an emergency.

Skin infections

  • Bacterial infections often cause red, inflamed circular patches on the skin that can smell pungent.
  • Cat bite abscesses are very common. They often develop over a few days, causing a painful, red, hot swollen area of skin.


  • If your cat has developed a rash that looks like blood spots or bruising it could be a sign of an injury or a blood clotting disorder. This is something you need to see your vet about ASAP.


  • Sunburn is a common problem especially around the ears and nose of white and ginger cats. Sunburn can be very painful and eventually lead to a skin cancer called a squamous cell carcinoma.
  • Feline eosinophilic granuloma complex is a skin condition caused by the immune system. It’s a fairly common condition that causes lumpy, sore, red, crusty skin.
  • Stress – some ‘highly strung’ cats will start over-grooming themselves making their skin sore if they are stressed.

When to contact your vet

Book an appointment with your vet if you notice anything wrong with your cat’s skin – skin disease can cause a lot of suffering.

You know your cat best. If they don’t have the symptoms listed above but you are still concerned it’s always best to contact your vet.

Published: October 2018

PetWise Pet Health Hub – brought to you thanks to support from players of People’s Postcode Lottery 

Written by vets and vet nurses. This advice is for UK pets only.

Illustrations by Samantha Elmhurst