Persol AC 2.5% Gel 20g contains benzoyl peroxide, a commonly used treatment for acne. It works by reducing acne-causing bacteria, unclogging pores, and reducing inflammation. The 2.5% concentration is suitable for mild to moderate acne and helps to clear existing breakouts and prevent new ones. The gel is applied topically to affected areas, and the 20g tube provides enough product for ongoing acne treatment.