Pigmented diseases can be classified into epidermal, dermal and superficial-dermal types according to the depth of their lesions. The epidermal type includes freckles, melasma, coffee spots, age spots, etc. Dermal type includes nevus of Ota, nevus of Ito, nevus of zygoma, nevus of blue, etc. The superficial-dermal type includes pigmented gross epidermal nevus, macular nevus, etc. In addition, tattoos, eyebrow tattoo, eyeliner, lip liner, exogenous pigmentation, etc. are not the body’s pigmentation problems belong to foreign pigment. Nowadays, laser treatment is generally used to treat pigmented diseases, and there are other treatments such as freezing and electrocoagulation, but they tend to leave scars. Laser treatment for freckles and age spots has the best effect and usually has satisfactory effect once; coffee spots, nevus of Ota, nevus of Ito, brownish nevus of cheek, pigmented gross epidermal nevus, etc. often need several times of treatment, but in the end, they can all have satisfactory effect. As for chloasma, due to its complex etiology, there is no specific treatment method yet, but now comprehensive treatment can have more obvious effect, which requires more than half year of treatment. In addition, tattoo, tattoo eyebrow, tattoo lip line, tattoo eyeliner, exogenous pigmentation, etc. are not pigmentation diseases in the body, but belong to exogenous pigmentation, and laser treatment can also achieve the desired effect, but in recent years, professional tattoo technology makes color complex, and the effect of washing color tattoo is poor!