This is a harsh mask and is not suitable for sensitive skin, skin with rosacea, or active acne. Lemon juice is highly photosensitive; if you expose yourself to the sun with traces of lemon on your skin, you will suffer severe chemical burns and permanent dark spots (phytophotodermatitis).
For this reason, it should only be used at night, and you must thoroughly wash your face the following morning, always applying sunscreen. Because baking soda alters the skin's natural pH, limit the use of this treatment to once every two weeks as an occasional deep cleanse, never as part of a daily routine.
