Stress, pollution, alcohol, sigarets, medical drugs are among the factors which can brake the immune system. But no matter what the reason is, if the immune system fails to provide protection, the eyelash mites (demodex folliculorum) start to respond by growing its population.
Small number of eyelash mites is harmless to humans, it can not cause any health problems. In fact, people don't even know that they have demodex mites living on the skin. The real problem comes only when demodex gets out of control.
Unexplainable loss of eyelashes, watery eyes, itching, burning and irritation of the eyelashes and eyelids especially at night could be signs and symptoms of eye demodicosis. These symptoms must be addressed to your doctor.
There are different anti demodex products available. Ask your doctor about possible side effects and the length of treatment. Some prescription and over the counter demodex products (cream, lotion etc) made with chemicals and antibiotics. If used for long time, chemical products can suppress the immune system of the skin. Cream with sulfur can dry your demodex prone skin. If skin gets dried, your body starts to produce more sebum oil that can feed demodex mites.