Vitiligo patients can eat watermelon without allergy. Vitiligo is an acquired disease, the etiology is not clear, its pathogenesis mainly includes immune mechanism, melanocyte self-destruction and so on. Some studies have shown that vitamin C has no inhibitory effect on melanin synthesis in vitiligo lesions, so vitiligo patients can eat watermelon. Although some studies have shown that vitamin C can reduce dopaquinone to dopa, blocking melanin synthesis; at the same time, it can reduce the absorption of copper ions, reduce the activity of serum copper oxidase, but clinical comparative study has not been found to be rich in high vitamin C diet and vitiligo development and occurrence of correlation. So vitiligo patients in the case of non-allergic can eat watermelon, if accompanied by diabetes should be limited consumption.