['Twenty cases of PWS were measured by means of Derma Spectrometer with the goal of estimating PWS condition.', 'Twenty patients of PWS were chosen randomly in this study. Derma Spectrometer was used to detect lesion and control sides pre- and post- laser treatment.', "The mean normal skin's M-Index was (36.18+/-6.45)%, E-Index was (1.39+/-4.85)%. Lesion's M-Index and E-Index were (44.85+/- 6.61)%, (13.05+/-6.30)%. Lesion's M-Index and E-Index after one treatment were (41.00+/-5.30)% and (9.04+/-4.98)%. Significant difference existed between normal and lesion's M-Index. Also there were difference among normal skin, lesion and lesion treated."] Do [ Derma spectrometer measurement for port wine stain ]?