A Split-face, Controlled Study to Assess the Compatibility of Tretinoin 0.05% Acne Lotion with Facial Foundation Makeup.

This study was conducted to assess compatibility of tretinoin 0.05% acne lotion with foundation makeup. This was a single-center, evaluator-blinded, randomized, controlled clinical trial. Participants were randomized to apply tretinoin 0.05% lotion to either the right or left side of the face before applying full-face foundation makeup. Participants were enrolled at a single center in the United States. Female individuals aged 18 to 50 years who used facial foundation makeup ≥5 days per week were included. Investigator-assessed grading for foundation coverage and participant evaluations of makeup appearance were conducted at post-makeup application (Post-Makeup) and Hour 6 (6H) timepoints. Antera 3D® images were taken for skin texture roughness analysis and tolerability evaluations were performed at baseline, post-tretinoin application, Post-Makeup, and 6H timepoints. A total of 30 participants were enrolled and 29 completed the study. There were no significant differences between tretinoin treated and untreated sides for any outcomes of investigator-assessed grading of foundation (percentage coverage, blotchiness, overall coverage, skin tone evenness, visual smoothness). There was a small but statistically significant worsening in percent coverage at 6H versus Post-Makeup on the untreated side, but not the treated side. As rated by participants, even/full coverage and skin smoothness were significantly better on the tretinoin-lotion treated versus the untreated side. Three-dimensional imaging showed there were no significant differences in skin roughness between the treated and untreated sides. Participants reported overall satisfaction with the tretinoin lotion-treated side. Tretinoin 0.05% lotion did not interfere with facial makeup application or wearability and was well tolerated.