Yes, their immune systems should take over. I had set up an appointment with the vet, but I'm going to cancel it. The spot is gone. I'm starting to think it wasn't ringworm and I just freaked out because of what we went through before. It was just strange that it grew and got rounder. I had put miconazole on it for a few days, and I'm wondering if that irritated the scratch. Perhaps it was just a scratch/wound from them playing? I don't know. In any event, it's gone. I'm still going to spray that area with lime sulfur, and I may give them both another bath this weekend (bathed them both last weekend as an all-over treatment instead of a dip since I wasn't sure what this was). With it going away so quickly, I don't think it could have been ringworm. We aren't even at two weeks from when I first noticed the scratch.
I'm doing the same thing -- mixed up a small batch for the spray bottle and I'm not doing the full dip. I've been shampooing her with medicated shampoo to get the topicals out of her fur, rubbing excess water out of her fur, and then dousing her neck and nape with the small batch of lime sulfur and massaging it into the problem areas. Also splashing her paws, since she scratches herself with her paws. I'm not seeing the problem spots anymore, but I'm going to finish the course of terbinafine and keep dipping for a few more weeks anyway. We did the antibiotics bomb for the tapeworm, and she's been good with the litterbox for several days (I set up a motion detector alarm in the area where she was going), and I am hoping we can have a parasite and bad habit-free kitten soon! Husband is getting impatient. I don't know if I'll do another PCR, frankly. At some point these cats' immune systems have to take over, right? Right?
Keep me posted on your kitty!!