Laser treatment for redness, if the correct dose is used, does not usually cause significant harm. If the laser dose is too high or if the patient’s skin is more sensitive, infection, recurrence or even sequelae may occur. Erythroderma usually refers to the appearance of capillary dilation on the skin surface, where capillary elasticity decreases and brittleness increases, resulting in continuous uneven expansion of blood vessels, redness of the skin, and dilated capillaries visible to the naked eye. Laser treatment for erythema is the use of selective photothermal reaction, so that the capillaries are heated and then coagulated and closed, for erythema has a very good removal effect. However, if the dose of laser is too large, the patient’s skin is too sensitive or improper care, it may lead to the following adverse reactions: 1. infection: if the medical institution is not formal, improper operation of the doctor during surgery, or improper post-operative care of the patient, post-operative infection may occur; 2. relapse: laser removal of erythrocytes is mandatory closure of erythrocytes through photothermal action, and does not have a permanent effect, most patients The effect can be maintained for several years, but a small number of patients may relapse in the short term; 3, sequelae: if the laser dose is too large, the patient’s skin is too sensitive, which may lead to the occurrence of sequelae, such as pigmentation or even scarring after the removal of red blood. It is recommended that patients choose a regular hospital for treatment, avoid sun exposure after treatment, and strengthen facial care. In addition, when choosing makeup or skin care products, you should choose regular qualified products to avoid containing hormones as well as heavy metals.