Q. Older cat for a month==excessive grooming,itching and several small nodules under skin on middle back .was excessive shedding in summer. Skin not red.

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A. Is very difficult to say without a picture of that skin but if is on middle back and is itching my first thought is flea skin allergy, sometimes they can be reacting without an infestation just with one flea bite. Best to go to yourvets because if starts scratching can infect the skin causing a Dermatitis.

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