The dark spots left behind by psoriasis belong to the local skin pigmentation after inflammation, which can be improved with the help of strengthening sun protection measures, medication and medical aesthetic treatment. 1. Strengthening sun protection measures: excessive ultraviolet radiation will aggravate local skin pigmentation, thus making the pigmentation left by psoriasis more obvious. It is necessary to pay attention to strengthening sun protection measures to help isolate the damage of ultraviolet rays on the skin, such as: using hats, masks, umbrellas, sunglasses, sunscreen clothing, sunscreen cream, sunscreen spray and other sunscreen items when going out. 2. Medication: For patients with mild psoriasis-induced hyperpigmentation, they can apply topical creams such as acepromazine cream ointment, hydroquinone cream, azelaic acid cream, and retinoic acid cream to help lighten the dark spots. At the same time, attention should be paid to the treatment of psoriasis primary diseases, such as external use of Dinaid cream, tacrolimus ointment, tazarotene gel, carbotriol ointment and other drugs. 3. Medical aesthetic treatment: For patients whose psoriasis has left more obvious pigmentation and greater impact on appearance, they can try Q-switched ruby laser, Q-switched alexandrite laser, picosecond laser, chemical peeling and other medical aesthetic treatments to help remove the pigmentation of the dark spots, which has a better therapeutic effect. It should be noted that the above drugs and treatment measures need to be carried out under the guidance of physicians to avoid adverse reactions.