Guidance:
Avoid sun exposure and apply sunscreen when necessary. Topical application of 3% hydroquinone, 3% hydrogen peroxide (hydrogen peroxide), 10% mercury chloride (white mercury), 0.025% retinoic acid cream, 1 to 2 times a day. Fewer numbers can be treated with new lasers, liquid nitrogen freezing spray, CO2 laser, etc., but caution is needed.
Chinese medicine can take six flavors of dihuang pills, free pills, can also be used externally to decolorize the plucking stick paste, or crystal paste corrosion.