To treat a cat allergy rash, take antihistamines, corticosteroids, nonprescription decongestant sprays or cromolyn sodium, which alleviates symptoms by inhibiting the release of immune system chemicals, according to Healthline. Other treatment options include leukotriene modifiers and allergy shots, which desensitize an individual to an allergen.
A nasal lavage is a recommended home treatment for cat allergies, because salt water cleanses an allergic person’s nasal passages, thus relieving sneezing, postnasal drip and congestion, as Healthline explains. Use over-the-counter brands, or create salt water by mixing one-eighth teaspoon of table salt and 8 ounces of clean water.
Control the occurrence of cat allergies by using high-efficiency particulate air, or HEPA, filters, which reduce airborne pet allergens, suggests Healthline. The filter traps allergens such as pet dander, pollen and dust mites. Removing cats from the allergic person's home may be necessary, and the associated allergens normally disappear within weeks or months.
Signs and symptoms of cat allergies include a stuffy nose, eye inflammation and a rash on the face, neck or upper chest, states Healthline. People with asthma also tend to suffer intense asthma attacks. If cat dander enters a severely allergic individual’s lungs, the person may experience coughing, wheezing and breathing problems.