My cat attacks itself...

I live in a rural area down the road from a church.  As with most churches, people abandon their animals frequently.  Due to this I have feral cats that showed up and started living in the barn.  All the animal shelters close are usually full, and since feral cats are definitely not in demand they're put down for the room.  I currently have 2 feral cats and one 1/2 Siamese kitten.  Both feral cats attack their right ear to the point where it's constantly bleeding.  The kitten is not having problems with it's ear.  The feral cats are related.  I thought perhaps it was ear mites, and it was hell getting those ear drops in their ears.  No improvement.  Could it be an allergy?

Maybe it's fly bites? Fleas? Fighting wounds? Are they fixed? If you get some Revolution from the vet, it would kill the ear mites and fleas without having to fight them to put drops in their ears.

If it were anything contagious, wouldn't the kitten have it as well?

Not fighting wounds...I see them attack themselves.

Not necessarily. Every cat is different. Those 2 might sleep on one side so the flies can only bite one ear, or use only one back paw to scratch their ears, etc. Who knows? Something itchy, for sure.

One's a boy and one's a girl.  We're on a waiting list for the girl to get spayed.

Both attack the same ear.   Not sure if they sleep on their sides.

She hasn't had a litter yet? Maybe she's already spayed. Most cats are pregnant with their second litter of the year by this time. Intact cats fight more, that's why I asked. It could be from fighting. That might be why the kitten doesn't have it yet--too young to really fight. Ask the vet to take a look at her ear when she's in for her operation.

I believe she's inbred to the point of where she miscarries somewhere...

I've only seen one litter which was last year, and they were not living.

Not optimistic about he waiting list...I've been on it for a year now....Going to take her up to kentucky to get her fixed in the next few months.

Inbreeding has nothing to do with whether or not the cat is possibly miscarrying, trust me, I have plenty of experience with feral cats/farm cats I've seen (and these were not mine they belonged to a wierd, sick (like, pyshically sick) old lady) cats so badly inbred that they phsyically LOOKED wierd (wierd shaped eyes, wierd noses, born with only 3 legs, badly bend tails ect) that were still getting pregnant and popping out more freaky looking kittens, but to get to that point those cats would have to have been inbreeding for SEVERAL generations(literally 10+ years) with no outside sources of new blood.

miscarrying has to do with hormonal issues, depending on where you're at most wild cats only have one litter a year, in some areas where the summers tend to be longer, they'll have two (around here, they only have one usually) and not all cats have kittens every year (I had a cat once go two years inbetween kittens)

my bet is on ear mites, or ear infections.

What kind of ear infections wouldn't show up in kittens until they're older?