blackspots

hi, Need help. My guinea pig fluffy has microscopic spots on her white fur. Is it some kind of parasite. What could be the treatment. I am in India need help with medicine if it is some kind of parasite. I have attached images of her.

Hi everyone, I have two girls at nearly a year old now, and I've noticed some little blackish spots in their hair lately. I've used a couple different mite and mange treatments but doesn't seem to be making any difference. Could this be lice? or something else? If this is mites, could someone...