Yes there is a correlation between feline asthma and eosinophilic
granuloma complex and other feline allergies. They are both believed to
be caused primarily by allergens (but other causes have been
implicated). The lesions that you have described do sound like they
could be eosinophilic plaques. Cats, like people, can be allergic to
anything. That includes anything inside the house or out: any
vegetation, fleas, pollens, grasses, etc, dust, dust mites, plastic
bowls or plastic toys, foods, and more.
Flea allergy is a very important allergy to consider. If you are not using a monthly anti-flea product, please start. Most of the time a flea is never seen. A flea can bite a cat, than jump off, and you will never see the flea, but if that cat has flea allergy dermatitis, it will be affected for a month or longer. Application of a monthly anti-flea product will eliminate this variable and allow you to concentrate on discovering any additional causes.
If you are using plastic bowls for the food or water please switch to ceramic or stainless steel.
Dry food is no longer considered the optimal type of food for cats. In the wild, the best food for a cat is a few mice, or fish or birds per day. Since cats originated as desert animals they derived all their liquid from their prey. It has been recently noted that cats still do not drink enough water to support an all dry diet. Additionally, cats bodies have no requirement for grains. Therefore, it might be best to wean your cat away from kibble unto all canned, grain-free foods, or a home-made diet. Some kibble can be given as a snack but should not be more than 1/3 of the daily diet. Increasing the wet food will also help with the hair balls. Omega 3 fatty acids from fish oils added to the diet can help with the hair balls, the eosinophilic granuloma and with any other dermal allergy condition.
Medication as well as eliminating the instigating causes are recommended as treatment options for eosinophilic granuloma and feline asthma. Prednisolone, and antibiotics, and other treatments may be necessary. These medications must be prescribed by your veterinarian.
Click here for valuable information as well as photos of eosinophilic granuloma complex
Citation: Dr Aleda M. Cheng DVM, CVA; posted on our Expert Ask a Veterinarian Forum