Wow, thats cool.
Did you change diet or lighting or something? I don't think its anything bad, in my opinion, it looks healthier. That's pretty darn cool. Post with more pics if it changes more. I wish my lizards would do that.
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My menagerie
1.1 Ball Pythons
1.0 Amazon Tree Boa
1.0 Corn Snake
1.0 Dumeril's Boa
1.2 Bearded Dragons
2.1 Crested Geckos
2.1 Sudan Plated Lizards
0.0.5 Eastern Painted Turtles
1.2.5 Eastern Box Turtles
1.1 Eastern Red-spotted Newts
1.0 Northern Mockingbird
0.3 Chickens
2.0 Cats
1.1 Ferrets
0.1.4 Wild mice
0.0.35 some kind of goldfish