Loss of lateral 1/3rd' of eyebrow is seen in -
Lepramatous leprosy is characterised by widespread nodules & infiltration ,with loss of lateral one third of eyebrows (madarosis). It is a immune complex(type 2) reaction. Nerve involvement will be late. Loss of sensation will be late. Reference Harrison20th edition pg 1054
Lepromatous leprosy
Taenia capitis
Tuberculosis
Tetanus
Infection