infections and infection with a mite called D. folliculorum, which can cause swelling and inflammation of the eyelash follicles.
Internal diseases like thyroid conditions, autoimmune diseases and leprosy can also lead to madarosis.
Treatment modalities for all are different. It would be better if you discuss these possibilities with an eyelid specialist (an oculoplastic surgeon).
Hope it helps. Take care and please do keep me posted on how you are doing or if you have any other queries.