Demodex folliculorum is an obligate parasite of human pilosebaceous
   follicle. Though attempts to elucidate the role of demodex in rosacea have
   produced conflicting results but several studies have suggested that this
   mite play a role in rosacea.

          This is a comparative, descriptive cross – sectional study that carried out
   on 39 rosacea and 41 non rosacea patients. These patients have biopsied in
   Department of Dermatology of Hamadan Sina Hospital in 5 years during
   1993-1998.

          The mean of demodex F. in the skin face of rosacea was 1.103 and for
   non-rosacea patients was 0.171. This difference from statistical aspect was
   meaningful (P< 0.05). There was no difference in mean of demodex in both
   sexes of rosacea patients ( P > 0.05). The mean of demodex in patients over
   40 year in comparison of below 40 years was meaningful (P < 0.05).

          In this study the mean of demodex in rosacea was higher than that of
   control group. But a prospective study with normal skin as control group is
   needed to clarify the exact role of demodex in rosacea.