This story appears in the February 2015 issue of National Geographic magazine. Currently two species of face mites are known; at least one of them appear to be present on all adult humans.

Dust and pet dander are common triggers for allergic asthma. Learn which indoor allergens trigger allergic asthma and how to ...

and mange mites. Lay recommends flea collars for dogs that cannot tolerate topical or oral flea products. Fleas are hard to see with the naked eye. Look for signs of a flea infestation on your dog ...

But, Varroa Mites are invisible to the naked eye - making them very difficult for both humans and bees to fight off. “If you’ve ever seen a frame for example, you know they’re in brood cells ...

Of course, with spring, it can be time for allergies in dogs to rear their head again ... dog is allergic to things like pollen and dust mites, so this is where the experts come in.