Laser principle 1. High energy pulse, absorbed by the hemoglobin in the lesion, thus destroying the red blood cells and causing the capillaries to coagulate, thus achieving the purpose of treatment. While the surrounding tissues are not affected by the conduction heat and are not damaged. 2, the course of treatment is every 3 to 4 weeks 1 time. Laser treatment precautions 1.After treatment, cold compress should be applied for 10 to 15 minutes. 2.There may be varying degrees of pain and swelling. The trauma surface may turn white and blister after laser treatment. If the blister is small, no special treatment is needed; if the blister is significantly larger, a sterile needle can be given to puncture it and attention should be paid to keep the blister epidermis perfect. After a few days of treatment, the tumor may form purple-red patches and scabs, and generally let the scabs fall off by themselves after 1-2 weeks. 3.If the local redness and swelling are obvious and the exudate is large, please consult a doctor promptly.