Quercetin, alias trishydroxyphenol acetone. It is a new type of natural skin whitening agent developed recently by foreign countries. It is mainly distributed in the peel and root bark of juicy fruits such as apples and pears. The phloretin can be applied to masks, skin creams, lotions and serums. It can inhibit the activity of melanocytes and have a lightening effect on various skin spots.