Prettyskin pH 5.5 Acne Cleansing Foam is a hypoallergenic, low acid cleansing foam that is created for troubled sensitive skin. Specially formulated to cleanse skin gently without irritation while removing skin waste from clogging pores. Contains naturally derived ingredients that soothe blemished and troubled skin. Helps to control oil, remove dead skin cells, remove sebum to make your skin moisturized. Tea Tree and Centella leaf extract help to soothe redness and to help remove sebum and dead skin cells. The most ideal pH level of the skin is pH 4.5 - 6.5. If it exceeds the level, the skin will be irritated. It will damage the skin barrier and will cause skin trouble. Hence, Acne Cleansing Foam pH 5.5 is slightly acidic and it balances the skin by maintaining skin barrier and protect skin from external irritation.