The principle of pulsed laser treatment for skin diseases is mainly to utilize the thermal effect of light in order to achieve the therapeutic effect. Pulsed laser treatment is one of the commonly used treatments in dermatology, and its principle is to utilize pulsed laser as a carrier of energy, and utilize the thermal effect of light to perform operations such as thermal ironing, cauterizing, and cutting on the localized skin in order to achieve the therapeutic purpose. For people who have pulsed laser treatment, there may be local redness or swelling complications, so it is recommended to strictly follow the doctor’s instructions for postoperative care, do not touch the water within a week to prevent bacterial infection. For those who need pulse laser treatment, it is recommended that patients do not eat spicy and stimulating foods with deep pigmentation before and after treatment, eat more fresh fruits and vegetables, and do a good job of sun protection. It is recommended that patients follow the doctor’s instructions for care after laser treatment, regular checkups, and timely consultation after discomfort occurs.