When using a face serum with 10% niacinamide for acne marks, here's how to incorporate it into your skincare routine: Cleansing: Start with a gentle cleanser to clean your face and remove any makeup or impurities. Toning (Optional): Follow up with a toner if you use one in your skincare routine. Serum Application: Apply a small amount (a few drops) of the niacinamide serum to your face, focusing on areas with acne marks or pigmentation. Patting In: Gently pat the serum into your skin until it is absorbed. Avoid rubbing or tugging the skin, especially if it's sensitive. Moisturizing: Apply a moisturizer to lock in hydration and further support your skin barrier. Sunscreen: In the morning, it's crucial to finish with a broad-spectrum sunscreen with SPF 30 or higher to protect your skin from further UV damage, which can worsen hyperpigmentation. Frequency: You can use the serum once or twice daily, depending on your skin's tolerance. Start with once a day and gradually increase if your skin responds well. Consistent use of a niacinamide serum can help fade acne marks over time and improve the overall health and appearance of your skin.