Dust mite size can be difficult to detect. By size, they are only 0.3mm (millimeter) or 0.011" inches long. They look like small white spider-like creatures.   Females can live up to 90 days, while males can live over a month.   Dust mites are everywhere in your home because they feed off of dead skin cells.   One person sheds on an average day about 1.7 grams of dead skin cells, which can feed up to one million dust mites   It is most likely that dust mites will settle in places that accumulate dead skin cells. Dust mites like rugs and stuffed animals.   Dust mites like hot and humid climates and can be found all over the world. They can travel with you when you move or are on vacation because they can burrow into cloth fibers. Dust mites can cause allergies. They leave behind fecal matter that can cause allergies.