Some long cross-linked hyaluronic acid may last longer. For example, if the face turns white, the molecular cross-linking is relatively large, and it may be absorbed slowly, and it may take a year or two to gradually absorb. The longer the crosslinking time of hyaluronic acid, the higher the probability of complications. Some people still find that the recovery is incomplete after using short cross-linked hyaluronic acid, that is, there will be residues in a certain period of time, which is a normal phenomenon.