After picosecond laser eliminates the pigmentation, you can use local external collagen surface dressing, vitamin E cream and so on. 1. collagen surface dressing: 0~1 days after picosecond laser operation, there will be redness and swelling, you can apply collagen surface dressing, collagen surface dressing has the effect of repairing, moisturizing, analgesic, reducing allergic reaction, etc., which can effectively protect the skin and promote the recovery of the skin barrier. 2. Vitamin E cream: picosecond laser 5~6 days or so, there will be a scab shedding period, when the scabs fall off, you can local topical vitamin E cream, can promote the repair of the skin barrier, thereby effectively relieving local pain, swelling and other discomfort, but also to reduce the local hyperpigmentation. 3. Hydroquinone cream: through the inhibition of tyrosine into dihydroxyphenylalanine enzyme oxidation and inhibition of other melanocyte metabolic process and produce reversible skin discoloration, can be used for laser treatment of skin damage after healing of hyperpigmentation. All the above drugs should be used under the guidance of professional specialists, avoid self-medication. After picosecond laser eliminates hyperpigmentation, must pay attention to sun protection, strong ultraviolet radiation is easy to lead to local skin obvious hyperpigmentation, thus affecting the therapeutic effect.