Introduction:  Microneedling  is  a relatively  new minimally invasive  procedure  involving superficial  and  controlled  puncturing  of the skin by rolling  with  miniature  fine needles. Traditionally  used  as  a collagen  induction  therapy for  skin rejuvenation  and  facial scars specially acne scars.

Aim of the work:  Evaluation of efficacy of microneedling  in treatment of acne scars.

Patients and  Methods:   Ten  patients  with  post  acne  atrophic  facial  scars attending  the. outpatient  clinic  of    Dermatology  in  Sohag   University  Hospitals  between  June2014  to September 2017  were offered six sessions of microneedling at an interval of 1   month.  They were evaluated monthly and one month after completion of sessions for both efficacy and safety of the procedure.

.   Results: The mean±  SD of the patients' age in the study population were26.900±5.952years old.eight females and two males with mean acne   scars  duration±   SD 8.500±6.311    years,

60% of patients had psychological distress  from their acne scars. At the end of study duration Out of the ten patients  7(70%) achieved one grade reduction in their Goodman and Baron qualitative grading  score while 4 patients  (40%  )  achieved reduction in their   quantitative ECCA " Echella d'e valuation Clinique des cicatrices d'acne" score with 8.55%   improvement in the ECCA score.  The mean  ECCA score value of V scar started to decrease earlier than U scar , but M scar was fixed up to end of sessions.

50% of patients had good satisfaction,  30% of them had very good satisfaction and only 10% had excellent satisfaction. All treated patients ,  had adverse events of  temporary erythema, edema, bleeding, or a serous ooze resolving with crusting or scabbing following each session of microneedling but in 1   patient (10%)  aggravation of acne occurred, bacterial infection  not

occurred in any of our patients.

Conclusion:   Multiple  minimally  invasive  sessions  of  skin microneedling  is  an effective treatment for post-acne atrophic scars with the advantage of being a relatively risk-free,  in office procedure with minimal patient recovery time.

Key words: , Scar, .