A new review of clinical trial data suggests that basic skin care routines, including gentle cleansing, moisturizing, and sun protection, can produce meaningful improvements for several common skin conditions, even without prescription medications.
The narrative review, published in Skin Health and Disease, examined the control groups, or “vehicle” arms, of randomized controlled trials. These are the participants who received a base formula without active prescription ingredients. Researchers from the University of Lancashire and NHS Foundation Trust dermatology departments searched medical databases including MEDLINE and Embase for these trials.
The review focused on five conditions: acne, actinic keratoses, melasma, post-inflammatory hyperpigmentation, and rosacea. The researchers then looked at what the vehicle arms achieved on their own.
For acne, two large phase III trials involving a combined 2,817 participants found up to a 25.7 percent improvement in overall facial acne severity and up to a 51.2 percent reduction in inflammatory lesions in the vehicle group alone. A trial of 468 participants with actinic keratoses showed up to a 24 percent reduction in lesion count and 17 percent complete clearance in the vehicle arm.
A trial of 48 participants with melasma found up to a 66.6 percent improvement in severity with vehicle treatment alone. For post-inflammatory hyperpigmentation, a phase IV trial of 123 participants showed up to a 44.9 percent improvement in overall disease severity with vehicle treatment. A multicentre trial of 120 participants with rosacea found up to a 27 percent reduction in redness in the vehicle arm.
The review’s authors note that vehicle arms in clinical trials often achieve a substantial portion of the efficacy seen in active treatments, frequently exceeding half. The baseline skin care steps can get users more than halfway there, they said.
The researchers also flag factors that can influence these results, including the Hawthorne effect, where people take better care of themselves when they know they are being observed, the placebo effect, and the fact that trial participants are often more consistent with their routines than they would be in everyday life. They advise interpreting the numbers with nuance.
Even accounting for these factors, the core finding holds that foundational skin care is a meaningful intervention on its own, not just a baseline before real treatment begins.
