My ball python is soaking, not eating, and has red patches. Is it ill?

I am sorry for the loss of your snakes. Ideally, Ivory should be physically examined by your veterinarian or an experienced herp vet, especially in light of your recent losses. The spots could indicate infection (bacterial, fungal or even a viral condition). It is difficult to make a detrmination by looking at an image.
In the meantime, clean and sanitize all the enclosures, bowls, hides and tank furniture. Discard anything that cannot be sanitized. Wash your hands thoroughly between handling each snake. Confirm, again if necessary, proper environmental parameters. Low temps can lead to stress which may predispose a snake to infection or illness. High humidity can foster bacterial or fungal overgrowth. Consider using paper towels as substrate until the issue is resolved. Change them daily to maintain clean conditions.