I would have a vet check it for ringworm. The redness indicates something is irritating the skin and causing the fur to fall out. It could be that she is chewing on them but you still need to find out the "why".
Yes, I;d check for ringworm, it always starts on feet, ears, eyes, or tail. Hopefully it'll be away with fast. I know when I had ringworm it took months. Good luck!