If they are not crawling on the lizards, they are probably harmless.

The mites that infest lizards are typically black or orange/red and tend to be found in the dorsal fold along their side.

Sometimes crickets that have just hatched look like little tiny whitish mites.
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11.14 L. getula californiae (Cal. King)
2.3 L. getula nigrita (MBK)
1.0 L. getula floridana (Brooksi)
1.1 Pantherophis guttatus guttatus (Corn)
0.1 Pituophis catenifer catenifer (Pacific gopher)
0.1 Heterodon nasicus nasicus (W Hognose)
4.2.14 Elgaria multicarinata multicarinata - (Cal. Alligator Lizard)