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Is this the boy that had the UTI back in December or a different one?
Is he eating?
Oh of course I remember. I was really worried about that boy and I'm sooo glad he is ok!!
This sounds like a much less serious issue.
Fortunately cats do not get as many skin conditions as dogs so they are much easier to diagnose and treat. They can be allergic reactions, fungus or infection.
Here is the most common with photos:
Stud tail:and feline acnehttp://www.kittens-lair.net/cat-health/feline-acne.html
Ringworm can be recurrent and is treated with a topical fungicide or a vaccine shot.
miliary dermatitis can come from a food allergy or the bite of even ONE flea.This is treated with one cortesone shot or neosporen it is safe it he licks a bit.
Granuloma is also usually allergic in nature and can be treated cortesone or antibiotics or both.
There is also alopecia which is usually symmetrical and can be self inflicted:
A staph infection is also a possibility and can recur at times when the immune system is weakened temporarily.
Please look at the photos and let me know which best relates to your cats issues and I will be happy to discuss this further with you and tell you how to treat it. Remember it may not look exactly as the pictures.
If it does not look like any pics check him for hyperthyroid and these:
http://www.sniksnak.com/cathealth/uroliths.html http://www.sniksnak.com/cathealth/fusfaqs.html http://www.sniksnak.com/cathealth/urethral.html http://www.sniksnak.com/cathealth/hyperthyroidism.html http://www.sniksnak.com/cathealth/diabetes.html http://www.sniksnak.com/cathealth/renal.html
They can all cause thining facial hair and he is the right age for them.Let me know how he is doing.