First of all, doctors must have a medical certificate registered in the hospital to prove that they are regular doctors. Many doctors in beauty salons practice medicine illegally. Engaged in medical beauty, must have a doctor's qualification certificate, a doctor's practice certificate and a medical beauty doctor's practice certificate. If you feel unreliable, you'd better choose a regular plastic surgery hospital or a domestic third-class hospital, so as to ensure better results. If you want to sue the hospital, you must have proof.