Evaluation of Pyroptosis-related Indicators in the Pathogenesis of Vitiligo:Across-sectional Comparative Study

2 ml blood will be collected from all participants (patients and controls) by aseptic venipuncture into plain tubes. Then the samples will be allowed to coagulate during 10-20 minutes. Serum will be obtained by centrifugation at speed of 2000-3000 cycle/min for 20 minutes. Then we collect the supernatant which immediately be frozen at -80°C until analyzed to determine serum levels of pyroptosis-related indicators (GASDM-D, IL 1β \& IL-18). Serum concentration will be assessed by a commercially available double antibody sandwich enzyme-linked immunosorbent assay (ELISA) kit