One of my alligator lizard eggs has a dark spot on the bottom - I noticed it about a week ago. The rest of the egg though is still bright white and the dark spot hasn't grown, and no mold.
One of the first clutches of alligator lizard eggs I ever had as a kid, they all caved in with about week left, and I thought they were all dead. I took them away from the warmth but I didn't toss them.
A week later there was a baby lizard on my wall. All of the eggs had hatched, each and every one of them - I only found two out of ten of the babies.
Anyway, don't give up until it is clearly rotten.
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3.0 WC; 0.1 CB L. getula californiae
0.1 CB L. pyromelana pyromelana
0.1 WC; 10 eggs (7/11) Elgaria multicarinata multicarinata