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HI this is DRB and I would be happy to help you with this. Flea allergic dermatitis is the most common cause of the symptoms you are describing. Unfortunately with this condition only 1 flea is required to make cat go crazy and scratch themselves to death. I would suggest you get some frontline plus for cats and apply it on back of neck every 2 weeks for 3 months total then go to every 28 days thereafter and keep it up.You may also find that you will need to take him in and get a steroid injection to make him comfortable. You probably should think about treating your home environment as well.
Please let me know if you need additional assistance. Sincerely, DRB
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You don't have to notice fleas, in fact they are usually not noticed by people until the infestation is massive. This really is the most common cause of what you are seeing. Other possibilities include food allergic dermatitis. But I would definitely rule out fleas first. Let me know if you need additional help. Sincerely, DRB