Pearl powder for removing acne marks does not have to be nano-scale. According to Compendium of Materia Medica, pearl powder has the effects of removing acne and treating poison. In modern medicine, pearl powder also plays an auxiliary role in acne marks. The specific usage is as follows:

Put the egg white of an egg into a small dish, add about 10g pearl powder and stir. Apply evenly stirred egg white and pearl powder to your face, avoid eyes and lips, and apply it as thick as possible, because egg white dries easily. 15 minutes or so, wash your face with warm water. Take vitamin C and collagen capsules orally at the same time.