Pityriasis lichenoides et varioliformis acuta is a cutaneous disease of unknown origin characterized by an acute polymorphous eruption which heals with superficial scamng and pigmentation. It occurs mainly in young adults and less commonly in children. Although various types of therapy have been proposed for pityriasis lichenoides, including systemic steroids, tetracycline, methotrexate, sulfones, an UV radiation, there is no definitive treatment and there is few studies of appropriate, efficacious therapy in children. We report a case of pityriasis lichenoides et varioliformis acuta in children treated with roxithromycin.