A case is reported in which tetracycline in a dosage of 2 gm a day had a demonstrably suppressive effect on the course of pityriasis lichenoides et varioliformis acuta. This is viewed as additional evidence that this disease may be of viral or infective origin.
Shelley WB, Griffith RF. Pityriasis Lichenoides et Varioliformis AcutaA Report of a Case Controlled by a High Dosage of Tetracycline. Arch Dermatol. 1969;100(5):596-597. doi:10.1001/archderm.1969.01610290080017