Clinical observation and anti-oxidation in treating chloasma with Queban Capsule Inhibition of extracts from Hangzhou Chrysanthemum Flos, Angelicae Sinensis Radix, and Salviae Miltiorrhizae Radix et Rhizoma on formation of chloasma and their mechanism Inhibition of extracts from Hangzhou Chrysanthemum Flos, Angelicae Sinensis Radix, and Salviae Miltiorrhizae Radix et Rhizoma on formation of chloasmaand their mechanism