Just found out I'm allergic to dust mites!  The main species are cosmopolitan pyroglphids but I call them House dust mites. 
I've always heard of them but don't know much about them.
they are so gross - they feed on skin flakes from people and pets, and sometimes mold. 
That does sound nasty, can people see them? Or are they microscopic?
they are so small and have translucent bodies so they are barely visible to most people 
Is there a way to get rid of them or reduce them? I'm wondering if they cause some of my family's allergy problems
Allergies are so bad and can cause red, itchy eyes and rashes, sneezing, face swelling - is that what your family has?.  So hard to treat them.
Not all the time but yes. It's hard to pinpoint allergies because theres so many causes
so many different types of allergies and symtpoms can be hay fever, food, atopic skin, asthma, rashes.  Difficult to pinpoint unless you go to an allergist
May have to do that. I think we're at least going to go through and super clean the house!