Parasites Mites or lice....?

Regardless of if they're mites or lice, treatment is the same, ivermectin.

Take a look at the parasites page here https://www.guinealynx.info/parasites.html

Revolution would work, too.

Do you think a vet is needed? All of my Gps have them. What do you think @bpatters

It's not mites. They burrow under the skin and can't be seen. It's either lice or flea dirt. If the little things are sticking to the hair shaft and you have to pinch them to pull them off, it's lice, and those are the nits. If the stuff can just be flicked off the fur, it's probably flea dirt.

Revolution would be the drug of choice, I think, but you'll have to order it from overseas (I think you can get it through Amazon -- you want the stuff for kittens) or get a prescription from a vet.

Does this mean they have fleas? How and how much for each pig?

No, it means just what it said:

If the little things are sticking to the hair shaft and you have to pinch them to pull them off, it's lice, and those are the nits. If the stuff can just be flicked off the fur, it's probably flea dirt.

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We'd have to know what the strength of the drug is that you get before we could calculate dosage.

It will be lice if you can see them. The vet told me that if you can see the bugs they are lice.