Looks to me like it's starting to go bad.
Here is what I would do
1# Candle the egg
2# Wipe the egg clean
3# Apply some Elmer glue (the one use by kids in school) on the moldy area and a little past that area, you can also use Athlete's foot powder
4# Put back in the incubator and see how it goes
If the egg is still viable it will slow down the progression of the mold, the good news is that I have seen perfect hatchlings coming out of ugly moldy eggs.
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