Sometimes the rodent ulcers just disappear on their own, which might be what your vet is waiting for. If it doesn't within one week, I'd take Mika back to the vet (or to another vet). In the meantime, you could try the fish oil capsules, because they won't hurt him. Try to get salmon oil with omega fatty acids (sold wherever there are health care products) in 500 mg. capsules. Stick or slice a capsule (1 a day), and squeeze the oil out over Mika's food. You can give him one a day for 6 - 8 weeks, and might see improvement within that period. As I mentioned, I participate in a German EGC forum, and many members have achieved good results with the capsules alone, though the capsules combined with cortisone shots seem to work best in mild cases.
Jamie's lip ulcer disappeared about 8 days after the first cortisone shot. As I remember it, my vet tested cells to rule out herpes, and concluded from the negative results that it was EGC. His ulcer was really small, though - actually barely noticeable. I used to sponsor a shelter cat, Norman, who had recurrences about every six months. He was adopted almost a year and a half ago, and his "parents" put him on the "pill" on the advice of their vet, and he hasn't had a problem for almost a year. This is such a weird disorder. Some cats get an ulcer on their lips, others on their bodies, and some even get ulcers on their inner organs.
Jamie's lip ulcer disappeared about 8 days after the first cortisone shot. As I remember it, my vet tested cells to rule out herpes, and concluded from the negative results that it was EGC. His ulcer was really small, though - actually barely noticeable. I used to sponsor a shelter cat, Norman, who had recurrences about every six months. He was adopted almost a year and a half ago, and his "parents" put him on the "pill" on the advice of their vet, and he hasn't had a problem for almost a year. This is such a weird disorder. Some cats get an ulcer on their lips, others on their bodies, and some even get ulcers on their inner organs.