Which type of product should NOT be used on sensitive skin prior to facial treatments?

Exfoliants should not be used on sensitive skin prior to facial treatments because they can cause irritation, redness, or inflammation. Sensitive skin is often more reactive, and exfoliants, which are designed to slough off dead skin cells, can disrupt the skin's natural barrier, leading to discomfort or an adverse reaction. For individuals with sensitive skin, it's crucial to prepare the skin in a gentle manner, using products that soothe and don't aggravate the skin condition.

In contrast, moisturizers, toners, and hydrating masks can provide essential hydration and balance without the harsh effects that exfoliants can have. These types of products are typically formulated to be more soothing and can help to calm and prepare the skin for further treatments.