Study of lip hydration with application of photoprotective lipstick : influence of skin phototype, size of lips, age, sex and smoking habits

Objectives: To study lip hydration levels when applying a lipstick sunscreen for 3 months and to evaluate the influence of size of lips, age, sex, smoking and skin phototype. Study design: The study group was formed by 140 volunteer subjects, one group consisting of 70 patients applying a commercial lipstick sunscreen three times a day and the other group of 70 controls in which no product was applied. The age range was 20-86 years. The influence in lip hydration levels of age, sex, phototype, size of the lips and smoking habits was studied using a Corneometer 825® (Courage and Khazaka Electronic GmbH, Cologne, Germany). Results: An increase in lip hydration was found between the basal (53.…