Hyaluronic acid, also known as hyaluronic acid, is a mucopolysaccharide, a component of the extracellular matrix, which is widely found in all parts of the body. Hyaluronic acid is highly hydrophilic and water retentive, and when it absorbs water, the expansion pressure it generates around it gives it the ability to support tissues. This property makes it an ideal filler for maintaining tissue form and function. Although hyaluronic acid-based injectable fillers have a high degree of safety and reliability, injection failures do occur from time to time, especially when injections are performed by clinically inexperienced physicians. When the injection level is too shallow, the amount is too much and the shape is not proper, subcutaneous nodules can occur 1-4 weeks after injection, the boundary is not clear, manifested as visible or palpable subcutaneous soft nodules, mostly in the forehead, periocular area, perioral area, chin and nasolabial folds and other parts of the body. Simple subcutaneous nodules formed in the short term after injection can be treated with massage and contouring, and those with poor results can be enzymatically dissolved with hyaluronic acid-based preparations. The phenomenon of filler moving outside of the original injection area is called filler migration. Filler wander often occurs in areas of the face that are frequently active, such as the nasolabial folds. To avoid this complication, injectors are advised not to inject too much injectable during the procedure and should also be careful to fill in areas of intense muscle activity or areas of weak skin. Injecting slowly using the appropriate levels and doses, while avoiding multiple massages after injection, etc., can help reduce free displacement of the filler.