Erythromycin is not a treatment for pigmentation. The main ingredient of Erythromycin is glycerin, and Erythromycin is mainly an anti-infection drug, both of which cannot treat pigmentation spots. After pigmentation spots appear, you need to pay attention to sun protection and go to regular medical institutions in time to clarify what kind of spots they are. If it is melasma, you can give vitamin C and vitamin E orally while protecting yourself from the sun, and you can also give hydroquinone cream topically to help the color recovery. If it is freckle, you can go to a regular hospital for chemical peeling treatment or carbon dioxide laser treatment, but there is no mechanism of treating the spot by using Kaiser or erythromycin.