Green birthmark is called nevus of Ota (also known as brownish-blue nevus of the palate of the eye) by modern medicine, and the disease suffered by Yang Zhi, the green-faced beast in Water Margin, is commonly known as green birthmark. Most of them are congenital, appearing soon after birth, and the clinical manifestations usually occur in the periorbital area, zygomatic area, sclera and other parts of one side of the face, with a grayish-blue color appearance, which does not subside throughout life and seriously affects the appearance. There are also those that appear as late as tens of years old. Nevus of Ota seriously affects aesthetics and brings great pain to patients. For a long time, there has been no ideal treatment for nevus of Ota, which is listed as an incurable disease in dermatology. Previously, there were some treatments that could only be used such as surgical excision, skin grinding, isotope removal and freezing. With the progress of science and technology, a kind of high-energy Q-tuning device (using the “blasting” effect of laser) can selectively act on the melanocytes in the skin in a very short time, so that the pigment particles are instantly crushed without damaging the surrounding normal tissue structure, and the crushed pigment particles are discharged out of the body through descaling, cellular phagocytosis, and lymphatic circulation. 254 Hospital has been providing the most effective treatment for nevus of arachnoid. The latest international pigment removal laser introduced by 254 Hospital can adopt different energies for different manifestations of nevus of Ota, and each treatment time is short and postoperative reaction is light. After laser treatment, the color of nevus of Ota’s treatment area will become lighter immediately, and after several treatments, it will gradually become dark red bruise. After about 1 week, the skin lesion will be healed by scabbing off. After laser treatment of nevus of Ota, it is enough to pay attention to local protection against sunlight. Most nevus of Ota can be completely cured in 5 to 10 times without leaving scars, and it can also rejuvenate the skin while treating nevus of Ota. It can be said that the incurable disease can be removed by “light”.