I was wondering what are the causes of madarosis?

Many: Madarosis, indicating eyelash or eyebrow hair loss has a variety of causes ranging from infectious, inflammatory, systemic, dermatological, toxic, medicamentosa and autoimmune. From an ophthalmologist point of reference, madarosis of the eyelashes is most commonly caused by blepharitis, eyeliner tattooing, and thermal damage seen in eyelash curling irons.