Clay usually has a negative electrical charge. ResearchTrusted Source suggests that this negative charge may help it bind to positively charged toxins and heavy metals like mercury and lead found in environmental pollution. Clay masks have the potential to absorb oil from your skin and prevent mild forms of acne, such as pimples, blackheads Trusted Source, and whiteheads. These types of acne form when your pores are clogged with excessive dirt and oil. Usage Apply the mask on a clean face as a thin layer, avoiding contact with the eyes and lips. After waiting 5-10 minutes, rinse your face with plenty of water. Apply to clean skin twice a week. Please test the product on a small part of your skin and do an allergy test before using it.