While skin allergies in cats are probably caused by fleas, there are an number of other things that can cause skin problems in cats, a vet has said.
Jo Inglis, writing for the Metro, said that other causes of skin allergies can include pollen, house dust mites and stress.
He had been contacted by a reader whose cat Lucy has been developing small irritating bumps on her skin on a regular basis.
Dr Inglis said that the cause was likely to be fleas, but other factors can cause this sort of problem.
He wrote: "If fleas are not to blame then there are many other things that can cause skin allergies, such as pollens and house dust mites.
"The final possibility is stress, which can also lead to skin problems. If there are other cats invading your cat's territory ... you need to look at how you can keep other cats away."
He suggested cat-proofing the garden and getting a microchip activated cat flap, but added that if the problem still persists, then to visit the vet to get a thorough examination.
As well as scratching, other signs of allergies in cats include sneezing, coughing, itchy and runny eyes, vomiting and diarrhoea.