Brownish blue nevus can be treated by intense pulsed light or Q-switched emerald laser, with the effect varying from person to person, usually need to do 4~5 consecutive treatments to eliminate. In the process of treatment, avoid sunlight to prevent recurrence. 1. Brownish green nevus may be caused by genetic factors, manifesting as brownish green patches with irregular edges on the skin. It can be treated by intense pulsed light or Q-switched emerald laser, the specific treatment effect varies from person to person, generally it takes 4~5 consecutive treatments to achieve the purpose of elimination. Redness or swelling of the skin may occur after laser treatment, and restorative ointments can be used to apply. 2. Patients should try to use warm water to wash their face within one week after laser treatment, avoid rubbing the affected area and do not wear make-up. Eat a light diet and do not drink alcoholic beverages. Reduce the intake of spicy stimulating food, can be appropriate to eat more fruits and vegetables. Wear sunscreen hats and clothes to avoid sunlight, so as not to cause pigmentation recurrence. It is recommended that patients with brown nevus go to the dermatology department of regular hospitals for consultation and laser treatment by professional doctors.