The study population will include at least 20 lesions in individuals with phototype IV-V, affected symmetrically by PA on the face. Their selected age will be less than 18 years. Patients with other dermatoses, including atopic dermatitis, use of any systemic or topical medication during the past 4 weeks will be excluded. Informed consent was obtained from the parents and children before entering the study, which was approved by the local ethical committee (Institutional Review Board).