It usually takes 1-3 months for laser eyebrow wash backdarkness to disappear. Laser eyebrow wash back black is usually caused by pigmentation after inflammation. People who suffer from black backlash don’t need to worry too much, the pigment particles can disappear gradually with the metabolism of the skin, and the phenomenon of black backlash will gradually dissipate in about 1-3 months’ time. In order to avoid the phenomenon of black back after laser eyebrow cleaning, the patient should first choose the regular institutions, and after the treatment should do a good job of sunscreen, in order to prevent the phenomenon of black back aggravated. When the phenomenon of back black after laser eyebrow cleaning, it is recommended to go to the regular hospital in time, under the guidance of professional doctors for standardized treatment, and follow the instructions for post-treatment care.