wild farm kittens one with sore

[lietzel]

We found 3 kittens in the barn the morning just a-hollerin' and without their mom around anywhere,they are about a maybe 6 weeks not sure. There are others whose mom takes care of them but these may be a younger mom who doesn't know better?
One has a sore about dime size on its rump. We took them too the porch , the other 2 seem healthy so they are in a crate with a towel. I washed off the sore , put peroxide on it then neosporin, mixed 1/3 2% milk with 2/3 distilled water (warm) and feed with dropper.

It's sleeping in a towel on my lap .

Any help would be appreciated,
thanks, Lietzel