pH-balance is a measure of how acid or alkali something is. The skin on your body has a pH-level of around
5.5. However, the pH-level of intimate skin is around 4.5.
If the pH of intimate vulval skin changes (making it less, or more, acidic) it can cause irritation, or – in some cases – cause bacteria and can multiply, resulting in infections such as bacterial vaginosis or thrush.