Primary Problem

• Dust mites are not parasites -- that is, they do not attach themselves to humans or animals -- and they do not bite. Dust mites are a problem because so many people are allergic to them. Otherwise, they pose little threat to humans.
  
  

Allergens

• Dust mites eat our dead skin cells, eliminating one source of dust. However, they also shed their own microscopic skins and leave microscopic feces, which become part of the dust stirred up in our homes. Many people are allergic to these by-products of mite life and develop symptoms similar to hay fever.
  
  

Breeding Conditions

• Dust mites thrive in humid conditions, and in places where they find plentiful food.
  
  

Prevention

• Environment, Health and Safety Online recommends using plastic mattress covers, washing bed linens in hot water and cleaning frequently to fight these pests.
  
  

Medication

• The Mayo Clinic says that while reducing the number of dust mites in your home can often clear up any allergies, some people are so sensitive that they require medication to control the symptoms.