A Non-invasive Imaging Approach to Evaluating the Immediate Mattifying Effects of Topical Skin Care Products: Method Standardization and Validation.

Immediate mattifying effects and pore-minimizing claims are common in facial cosmetics; however, objective and standardized assessment methods remain underreported. This in-house exploratory evaluation aimed to standardize methodology for assessing the reduction in facial pores by using instrumental assessment and image analysis. A split-face design was conducted on 20 healthy female volunteers. A cosmetic leave-on face cream was applied to the right side (treated), while the left side served as an untreated control. Skin roughness, smoothness, and pore size were assessed using the VISIOSCAN VC 20 Plus (Courage+Khazaka electronic GmbH, Cologne, Germany). Pore size and pore area were further evaluated using Image-Pro® 10.0 (Media Cybernetics, Inc., Rockville, Maryland, United States), at baseline and 15 minutes post-application. Application of the test product at the treated site resulted in a measurable reduction in both skin pore size and skin pore area, accompanied by significant improvements in skin surface roughness and smoothness within 15 minutes post application. In contrast, the control site (water-rinse) did not exhibit any notable changes across these parameters. These differences highlight the sensitivity of the analytical approach in detecting early, product-induced skin surface improvements. This in-house exploratory evaluation primarily served to assess the feasibility and robustness of a standardized methodology for evaluating the immediate effects of cosmetic leave-on formulations. By combining high-resolution photographic image analysis with VISIOSCAN VC 20 Plus instrumentation, the study established a reproducible, quantifiable approach for assessing short-term changes in skin surface attributes such as pore size, roughness, and smoothness.