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Background: The Janus‐III measurement system evaluates the overall skin characteristics such as skin pore, wrinkle, sebum, porphyrin, skin pigmentation, and skin color using high‐resolution facial images. The values are measured from five different facial areas, namely, the forehead, nose, corner of/skin below the eyes, and cheeks. Owing to its convenience and diverse measuring characteristics, Janus‐III has been widely used in skin research and the cosmetic industry in Korea. In our previous study, we revealed the consistency and reliability of the system with repeatedly measured values. Its measuring performance was investigated statistically, but to make it more reliable for academic skin research, additional verification by a professional dermatologist is needed. Materials and Methods: In this study, we conducted comparative analysis of three skin characteristics (pigmented spot, skin color, and eye wrinkle) by a dermatologist and the Janus‐III measurement system. We utilized 330 image data that were cropped from the whole facial images of 330 different participants to avoid correlation among the three measuring items. Pearson's correlation coefficient exhibited similar patterns between the system and the dermatologist's findings. Results: The main finding of our study was that the measured value of skin characteristics by the Janus‐III system showed clear correlation with the values evaluated by a dermatologist, especially in a pigmented spot. Conclusion: Therefore, it would be a plausible idea to consider the Janus‐III system for specialized research of skin characteristics even with a small sample size. [ABSTRACT FROM AUTHOR]

Background: For personalized skin care, noninvasive quantitative methods to evaluate facial skin characteristics are important. Janus‐III is one of the most widely used imaging analysis devices in the skin care industry in Korea. Janus‐III generates values for a range of skin characteristics. Due to the convenience of obtaining results for a variety of skin characteristics in a single measurement, the use of Janus‐III in cosmetic stores and research institutes has been recently increasing. However, the consistency of skin measurements of Janus‐III has not been elucidated yet. Materials and Methods: In this study, we repeated skin measurements three times for 70 different subjects and compared each numerical value in order to assess the consistency of the Janus‐III. For this purpose, we compared between‐sample distances and within‐sample distances. Results: We found important patterns for future analyses in terms of consistency. First, the average values of skin measurement categories were more reliable than individual part values of facial segments. Second, center part values such as forehead and nose were more reliable than side part values such as left and right part segments. Conclusion: If researchers who use Janus‐III for studies of facial characteristics analyze average and center part values first, they can obtain relatively reliable patterns of facial skin characteristics. [ABSTRACT FROM AUTHOR]