title: Liquid nitrogen in the treatment of acne vulgaris: a comparative study.
mesh_terms: D000152:Acne Vulgaris / Q000188:drug therapy*; D000293:Adolescent; D003452:Cryosurgery; D003879:Dermatologic Agents / Q000627:therapeutic use; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D009584:Nitrogen / Q000627:therapeutic use*
chemical_list: D003879:Dermatologic Agents; D009584:Nitrogen