Background: Acne is a common inflammatory skin disease with an increasing prevalence in adult women. Existing treatment options often have inadequate efficacy and significant side effects. Purpose: To investigate how women perceive the relation between diet, lifestyle and adult acne. Method: Participants to a web survey were recruited on Facebook. Quantitative statistical analysis of 101 completed questionnaires was performed in SPSS. One Sample Wilcoxon Signed Rank test, Chi-square Test and Mann Whitney U test with the significance level p <0.05 were applied. Results: Dietary factors considered to aggravate acne were: milk products, chocolate, alcohol, sugar/foods with high sugar content and foods with high saturated fat content (p <0.001). Poor sleep and/or too few hours of sleep, stress, tobacco, smoking and snus were lifestyle factors that were considered to aggravate acne (p <0.001). The diet and lifestyle factors that were considered to reduce acne were: fruits and vegetables, Mediterranean diet, dietary supplements of zinc and good sleep and/or enough hours of sleep, physical activity and meditation or other relaxation exercises (p <0.001). The majority of the participants responded that diet and lifestyle factors are often not included in the treatment for acne, but favored that they should be included. Websites on the internet was the most common source of information. Healthcare professionals ("doctors/nurses") was the most trusted source of information. Conclusion: The participants' perceptions on the links between adult acne and diet and lifestyle, respectively, were broadly in line with what is described in the scientific literature as well as in official diet and lifestyle recommendations. The participants trusted advice provided by the healthcare system on relations between adult acne and diet and lifestyle and were in favor of receiving more advice of that type.