21/08/2026
A double skin hit - the prevalence of acne is significantly among rosacea sufferers than the general population. But despite the risk, the factors causing acne in those with rosacea have been unclear.
A recent cross-sectional study linked one surprising and one not so surprising factor.
Not so surprising is sleep duration. Rosacea sufferers getting enough sleep were less likely to develop acne as well. This isn't surprising because previous studies have shown that enough sleep plays an important role in reducing systemic inflammation levels and promoting the repair of the skin barrier, both of which are protective against acne.
The more surprising factors was that frequent sunscreen use may increase the risk of acne. We are all told to 'slip, slop, slap' particularly in sunny QLD. While there is variance with this effect, some chemical UV filters, such as benzophenone-4 and para-aminobenzoic acid derivatives, may cause skin irritation.
Acne risk could also be associated with the comedogenic properties of certain sunscreen formulations (yes, particularly some of the natural products).
So, while I am cautious about making generalities about sunscreen for those with rosacea and acne, if you are using sunscreen daily, it may be worth looking at the ingredient list and / or if it is likely to have a comedogenic effect. This correlation certainly doesn't preclude use in full sun, but is linked to frequency of use (i.e., daily use).