There are various treatment methods for acne, but in the case of acne treatment with Photofacial M22, it is possible to aim not only for acne but also for improving skin quality. However, Photofacial M22 is not a treatment that can improve all acne symptoms. Therefore, it is important to know in advance the types of acne that can be expected to be effective with Photofacial M22 and the types of acne that cannot be expected to be effective.