A multicenter, randomized, single-blind (evaluator blind), parallel controlled clinical study to evaluate the efficacy and safety of an injectable poly-l-l-lactic acid filler for the treatment of temporal depression

INTERVENTION: Experimental group:Use a poly‐l‐l‐lactic acid filler for injection;Control group:don't do any temporal therapy; CONDITION: Temporal depression PRIMARY OUTCOME: ATHS scale; SECONDARY OUTCOME: GAIS scale; INCLUSION CRITERIA: 1. The subjects are over 18 years old, regardless of gender. 2. Subjects are willing to undergo temporal filling therapy. 3. The subjects have mild, moderate or severe temporal depression (grade 2, grade 3 or grade 4 in evaluation by blind researchers) and the difference in the score of bilateral temporal should not be more than grade 1. 4. The subject is in good compliance, willing to follow the study instructions, follow the medication and treatment restrictions specified in this protocol, and complete all study visits as required. 5. Subjects fully understand the purpose and design of the clinical study and voluntarily sign the informed consent.