I'd get the snake tested for cryptosporidium. The lump is a characterstic of this protozoa. It is highly contagious and nearly always fatal. Are you keeping your corn snakes away from your kings? This might be the reason (if it's crypto) that it's spread to other kings, but not your corns.

At any rate, I'd at least take a snake that died to a vet and see if they can determine what's happening.

Tim

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