Spring is coming and with it allergies. In addition, every day there are more and more people who have problems related to dust mites. But what do we really mean when we talk about dust mites? Dust mites are tiny microscopic animals of about 0.3 millimeters and live in almost all parts of the world even if we cannot see them. One of his habits is dust inside the houses. So even if you do not know, in your home there are probably thousands of them. Specifically, their favorite places are mattresses, pillows, stuffed animals, rugs, etc. First, because they are somewhat phobic to light and on the other hand, because in these places they can find one of their favorite foods: scales of human and animal skin. In addition, they survive the vacuum cleaner because they have nails like claws on the legs, which cling to remain in the place where they are. This whole world is in front of us and we cannot see it. This causes that house dust is the main source of allergens inside homes, unlike pollens, seasonality is less noticeable and we can find them all year. Indeed, it is estimated that dust mites may be a factor of 50 to 80% of asthma cases and cases of eczema, fever and other allergic diseases. Specifically, the patient's allergic reaction is caused by the egg and mite feces, when people breathe the particles. The average life cycle for a male house dust mite is 10 to 19 days. A mated female house dust mite can last up to 70 days, laying 60 to 100 eggs in the last 5 weeks of her life. In a 10-week life span, a house dust mite will produce approximately 2,000 fecal particles and an even larger number of partially digested enzyme-covered dust particles Finally, another problem related to mites are heating systems which exacerbate the problem by spreading dust. That is why we must be aware of the organisms that live in our home and try to avoid their reproduction as much as possible not to affect our health using the best specialized devices.