early signs of mites

[peterm15]

after searching through MANY posts (4 pages) and comming up empty i decided to post my question...

without actually seeing mites is there any way to tell if you have them.... i dont believe i have any but i would like to know the early warnings just in case the problem ever arises...

the only info that i could find is how to kill them... so any help is great...

in case this helps i have a veild cham, 2 leos, and a central american banded gocko.. and soon to have a few cresties... but i would like to know any symptons for any species... snakes, moniters, ect. ect...

thanks for any replies and help...