A Study to Evaluate the Safety and Effectiveness of Kytogen Defend in Facial Skin Quality Improvement in Adult Participants

Inclusion Criteria: * (1) Subjects ≥18 years (subject to the time of signing the ICF), without any restriction on gender; (2) Skin types ranging from type II to IV according to Fitzpatrick classification; (3) The subject exhibits symptoms of dry skin and dull complexion on face, and has a temporary need to improve the quality of facial skin. After evaluation by the investigator, it is deemed suitable for improvement through the medical device used in this trial; Exclusion Criteria: * (1) Subjects who have known allergies to Carboxymethyl Chitosan Solutions or any ingredients contained in the product; have known allergies to any local anesthetics (e.g., lidocaine or other amide-type anesthetics) or to an excipient of 5% EMLA cream; are allergic to chlorhexidine (or similar products) or to an excipient found in 0.5% alcohol chlorhexidine; or have a history of severe allergies or any episodes of anaphylactic shock; (2) Subjects having participated in other clinical trials within 1 month prior to enrollment in this trial or being currently participating in other clinical trials; (3) Females who are pregnant, breastfeeding, or planning to become pregnant during the study, or those who have been menopausal for less than 1 year or are in the perimenopausal phase without undergoing hormone therapy; (4) Subjects who have been exposed to strong sunlight or strong ultraviolet rays within 1 month before screening, or who are expected to work outdoors for a long time or need to be expo…