Sun exposure after pulsed laser may result in hyperpigmentation and thermal burns due to UV exposure. After pulse laser treatment, the skin tissue is stimulated by the laser and is in a sensitive period of repair. Generally, it is recommended to strictly protect the skin from sunlight after laser treatment, otherwise it will be easier to have pigmentation due to ultraviolet ray irradiation than the skin without laser treatment, resulting in freckles, sun spots and other pigmentation diseases. There is also the possibility of sunburn if exposed to the sun for a long time. After laser treatment, you must take care of your skin scientifically and pay attention to sun protection. In addition to the use of sunscreen, you can also use umbrellas, masks and other methods, and at the same time, it is best not to go out when the ultraviolet rays are strong. If there is burning, redness, swelling and other discomforts after sun exposure, it is recommended that you seek treatment in a regular hospital to avoid improper disposal leading to adverse consequences.