Cilantro is rich in vitamin C, but the effect of spot removal is not sure. Cilantro can be boiled in water for about 5 minutes, because it contains certain volatile oil components, and too long decoction time will destroy such components, causing the effect to decrease. It is recommended to wash or wet compress directly for about half an hour every night, the effect is very slow and the spots on the face may fade away in about half a year. However, it should be noted that the effect of washing the face with cilantro alone is not as good as imagined. It is better to take vitamin C, glutathione tablets and traditional Chinese medicine with oral treatment, and apply hydroquinone cream after washing face with cilantro water.