Cats: fly/mosquito bite caused dermititis

Question
My cat has been coming in with bites on his ears and bridge of his nose.  I'm not sure if it is from flies or mosquitoes, or a combination of both.  I'm almost positive it's not fleas since I apply Advantage each month. I've been scouring the web looking for preventative remedies and so far can only find answers for DOGS.  I realize they can probably use the same products, but the difference is if I put anything on my cat, he has to be able to eat it without getting sick because it will undoubtedly get in his mouth when he's cleaning himself.  The bites have been getting worse, and I can't really leave him inside all the time.  Please let me know what I can use to treat the sores that are already there and what can be used to prevent them from happening again!  Sorry this is so long, I wanted to be as specific as possible.  Thanks in advance for any help!

Answer
Cats do get mosquito bite hypersensitivity on the nose.  Advantage only kills fleas.  You can use Frontline, which will help kill the mosquitos and you probably need to get your cat indoors more. There is fly repellant called VIP fly ointment which MAY work to be a repellant. YOu would put it on the tips of the ears daily.