Regularly doing seaweed masks will not darken your skin under normal circumstances. The main functions of seaweed mask are moisturizing, antioxidant, repairing skin damage, increasing skin elasticity, etc. It will not directly cause skin darkening.

However, if the seaweed mask used is of poor quality or has expired, it may contain irritating or toxic substances that can cause adverse reactions on the skin, including darkening. In addition, there may be many reasons for skin darkening, such as prolonged exposure to the sun, staying up late for a long time, malnutrition, etc.

Therefore, in order to maintain the health and beauty of your skin, in addition to using seaweed masks correctly, you also need to pay attention to maintaining adequate sleep, a balanced diet and appropriate exercise.