That hormone is not going to cure ulcers.Your kitty needs clavamox or clindamycin antibiotic ASAP.
He should also be geting 150 mg of l-lycine in his water daily.
He may have stomatitis, herpes or calici virus.
Cats that have Stomatitis, which is a severe infammation of the mouth have a lot of pain and often stop eating. That is a different condition than normal gingavitis which is treatable by dental scaling. However, Stomatitis is NOT treatable so annual cleanings are a waste of time and money because the oral bacteria enters the stomach and makes the cat extremely ill. Antibiotics and steroids are often used.We usually recommend removal of all teeth for best results. Then the cat lives a normal healthy life eating soft food.He does not even miss the teeth.Here is info you can print and refer to.
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 symetrical 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.
You can apply neosporen to the lesions. and it should help until you can get the antibiotics for your boy.
I hope he feels better very soon.
Sincerest best wishes,