With the development of laser aesthetic technology, many aesthetic skin diseases (such as acne, freckles, hirsutism, red face, rosacea, etc.) can be well treated with modern laser technology, but not all patients are suitable for laser treatment. 4. pregnancy or lactation; 5. epilepsy; tumors, especially skin cancer; 6. sun exposure or tanning in the last 3-4 weeks; 7. scarring; 8. use of photosensitive drugs (such as hydroxychloroquine, retinoids, etc.); light-sensitive diseases; 9. use of anticoagulant drugs; previous blood coagulation lesions; 10. active herpes simplex disease.