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I know that mites can't be seen but the wee tiny black bits on the hair usually mean that there are mites there as that is their pooh!
How would you look for mites?
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I think you are confused with fleas. That is how I was told to check for fleas by my vet 20 years ago. He called flea dirt "pepper".
I am sure the waste product from a microscopic creature would be microscopic itself.
As for how to test for them, you could do a painful skin scrapping and then look with a microscope at the skin you scrapped off. However it is painful and results in a lot of false negatives, as mites on the pig, may not end up in the sample!
The way most people diagnose is as PiggieMom says, by symptoms!