I'm not sure about geckos, but my female bearded dragon lost some scales on her head while she was mating(mean male) and the scales grew back, they don't look exactly the same, but are the same color.
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www.freewebs.com/snakesandstuff
"Let us step out into the night and pursue that mighty temptress, adventure." (Albus Dumbledore)
My menagerie 
2.1 Ball Pythons 1.1 Amazon Tree Boa 1.0 Corn Snake 1.0 Dumeril's Boa 2.1.10 Bearded Dragons 2.1 Crested Geckos (and 2 eggs!) 1.1.4 Eastern Box Turtles 1.0 Northern Mockingbird 0.3 Chickens 2.0 Cats 1.1 Ferrets plus lots of mice, goldfish, and feeder insects


