When i first bought mocha- she was covered with mites. (she came from bad pet shop). I went out and bought a spray on medicine that will kill mites, fleas, lice, ticks and other pests. It was called- Ultra Care 8 in one pro.
If u are going to buy something for mites I recomend
u get something like this because it killed them the first time.
When you are looking for mites part your gp's hair so that you can see the skin. Wait for a few seconds and just look directly at the skin. Usually within a couple seconds you'll notice something moving on the serface of te skin.
You CAN'T SEE mites. They are microscopic. You can only see LICE and FLEAS. MITES must be treated with a drug called ivermectin. It's best to take your guinea pig to a vet to be treated for mites as dosing with ivermectin is tricky.