Infestation with the mite D. folliculorum which inhabits the eyelashes is well known. Two species are known to inhabit human beings—D. folliculorum and Demodex brevis. It might either be asymptomatic or may cause symptoms of blepharitis. Kemal et al. report an overall prevalence of 27.4% in their study group. Gao et al. have reported a 100% prevalence of the mite when there is cylindrical dandruff. Patients with demodicosis can develop madarosis.
Blepharitis is a chronic primary eyelid inflammation. It is fairly common in occurrence and being a condition with remissions and relapses, results in a decreased quality of life if adequate measures are not taken. Chronic blepharitis is the most common condition associated with madarosis. Though there are various ways of classifying blepharitis, the most useful is the one proposed by Wilhelm, wherein blepharitis can be classified based on whether there is a predominant involvement of the part of the eyelid anterior to the gray line (anterior blepharitis), or posterior to the gray line (posterior blepharitis). The gray line is an imaginary line dividing the eyelid into an anterior part consisting of the skin and muscle, and a posterior part consisting of the tarsus and conjunctiva.
Try to include 'hair friendly' foods in your diet, such as Omega 3 rich salmon and walnuts; beat-carotene rich sweet potato, butternut squash, carrots, pumpkin and spinach (yes, dark green veggies are a good source of beta-carotene too); and foods like eggs (rich in biotin, B6, B12, selenium, zinc and copper), lentils (which are loaded with hair-healthy vitamins and minerals), chicken or turkey (which contain lots of protein, B vitamins and minerals), plus vitamin C-rich fruits and vegetables like blueberries, kiwi, strawberries and tomatoes.
Stress: Emotional and physiological stress can trigger a few hair loss conditions that can affect your eyebrows. Telogen effluvium, for instance, can cause your hair to shed. Then there’s trichotillomania, which is a psychiatric condition caused by stress that is characterized by the urge to pull out your own hair (which could be from your eyebrows, eyelashes or scalp).