Fractional laser may lead to transient side effects such as erythema, pain, pigmentation change, etc. Improper operation may also lead to serious and other adverse consequences such as infection, scarring and burns. 1. Fractional laser technology is often used to improve fine lines, lighten pigmentation, improve scarring, etc. After treatment, local skin will appear redness, erythema, pain and other transient side effects, which is a normal phenomenon, and can be receded by itself through scientific care. However, it is necessary to pay attention to light diet, avoid eating spicy, stimulating and greasy food, quit smoking and drinking, and eat fresh fruits and vegetables. 2. Improper operation may lead to burns on the skin, which may result in infection, erythema, depigmentation, hyperpigmentation, depressed scarring, hyperplastic scarring and other more serious consequences. Therefore, it is recommended to go to a regular hospital in order to achieve the best therapeutic effect and try to avoid the occurrence of serious side effects. On the other hand, not all people can undergo laser spot treatment, such as keloid, light allergy, severe diabetes, long-term use of psychotropic drugs, high blood pressure or diabetes, pregnancy, etc. are not suitable, therefore, before the treatment need to go to a regular medical institutions, and specialists to communicate in detail after treatment, so as not to lead to the occurrence of adverse consequences.