My siamese has sores all over his body

Question
My siamese cat has sores all over his body.  He's been to my vet twice.  The first time he was given antibiotics to see if the condition improved.  My vet thought it was getting better, but now it seems worse than ever.  The vet thought he could be fighting with other cats, but all 3 of my cats go outside and he is the only one with a problem, and only recently.  He is not aggressive or territorial at all and he is fixed.  I've had the same vet a long time and I trust him, but I'm considering getting a second opinion.  Also, the areas around the sores have lost his hair.  Have you ever heard or experienced anything like this?  Thank you- any help would be appreciated.  P.S. The vet did not seem to think it was mange or ringworm

Answer
Hi Kacey!
Are you sure your cat doesn't have fleas?  Cats with flea allergies will have sores all over their body too, and if a cat is allergic, it will take only one flea to do that.  If you don't think it's fleas, then it still may be some type of allergy,food or otherwise.  If you can bathe him, give him a bath with medicated shampoo.  Leave the shampoo on him at least five min, then rinse and dry well.  Do this once a week and see if it helps.  If he doesn't get better, then I agree that you should get a second opinion.

God Bless,
Becky