I want to see how your eggs are setup and what the spot looks like.
Are your eggs in a tubs with the lid on?
Spots can be anything from wet spot (condensation dripping on the egg or substrate to wet), to egg starting to mold (which sometime is nothing so moldy eggs go full term, to the egg that died and start to mold).
Only with a picture or two can we guide you with the next step.
And no there is no such a thing as too much humidity as it should be as close to 100% as possible.
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