A. Patchy red areas on cats are commonly associated with a condition called eosinophillic granuloma complex. These are caused by an intense allergy in the cat. Some common causes of this are plastic bowls, toys and just about any allergen source (i.e. Dust mites, grass, fleas, etc). This is a very involved disease process and I would recommend that you have your vet examine the skin and do testing (i.e. Skin scrape/biopsy) to confirm. Solutions for this condition involve suppressing the allergic reaction with steroids +/- immune suppression drugs and treating any secondary bacterial infections with antibiotics and topical medicated shampoos.
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