The search for "BARSAN 2021 SKIN" does not yield a single academic or medical article with that exact title. However, the query likely refers to research or classifications related to skin quality and typing published or active around that time.
TABLE 1. Proposed Skin Quality Attributes and Their Definitions. Attribute. Definition. Uneven pigmentation. Variation in melanin. PubMed Central (PMC) (.gov) BARSAN 2021 SKIN
Below are the most relevant studies and tools from that period that match the themes of your request: The search for "BARSAN 2021 SKIN" does not
Defining Skin Quality: Clinical Relevance, Terminology, and ... - PMC and ... - PMC