Double eyelid surgery is a more mature surgical procedure, but the surgery itself is invasive and may cause post-operative complications, mainly related to improper surgical operation. Therefore, if a patient goes to an informal cosmetic facility and chooses an inexperienced and unqualified surgeon, the following hazards can occur: 1. Infection: If the patient goes to an informal facility, the infection may occur due to poor disinfection, corneal infection, bloodstream infections, etc. The wound will heal more slowly after the infection and the scar will be more obvious; 2. If the surgeon is inexperienced and designs the lid margin too wide, the eyelid is unnatural and unattractive, and some patients may even have triple eyelids; 3. If too much tissue is removed during eyelid surgery, it can lead to low tear secretion and dry eye; 6. Eyelid ectropion: If too much tissue is removed during suturing, it can lead to eyelid ectropion.