Hi T.,
First let me say I admire your courage & strength to take in these children. God bless you, you are doing a wonderful thing.
FYI, pinworms & ringworms are not the same thing. Ringworms are a fungal infection, whereas pinworms are actual worms that finds its way into the intestines. For the treatment of ringworms I've heard that creams & sprays for athlete's foot will work. Maybe try spraying their shoes with it too.
Is the area getting better & then returning or has it been there & stayed there without subsiding?
If you've tried all of the remedies for ringworm, maybe it's not ringworm. I suggest trying to get a 2nd opinion from another pediatrician if you can. If not, then speak to the kid's doctor & frankly tell him/ her that you cannot afford to take the kids to a dermatologist because all the one's you've found that accept Medicare, will only treat Medicare patients with cancer. It is a problem that the doctor needs to help you with! Be persistent because he needs to either find a dermatologist that can see the kids, or he needs to figure out what's going on.
You can also do a little investigation of your own either at the library with medical/ dermatology books (with photos) so that you can try to figure out what this is, or you can maybe research online.
I wish you all the best with this issue & with your new brood in general.
Sincerely,
A.