Objective The facial infection of demodicid mite among medical university student in Nanning city was surveyed in order to provide a basis for further prevention. Methods Student volunteers of medical university in Nanning city were selected randomly. Etiological examination and questionnaire survey were used for investigation of facial demodicid mite infection. Results Among the 1 149 students,there were 209 students affecting the demodiced mite. The total demodicid mite infection rate was 18. 19%( 209 /11...