Hi . greetings. I am sorry I an unaware of any medicine claiming to be a blood purifier in allopathic medicine. Our kidneys and liver serve as the best organs to "purify" blood every second... So I am not sure if any drug does it and if it has any role in acne control. Kindly see a qualified dermatologist near you for further treatment or you could send in further queries / appointment request on follow up chat. Hope this helps. Warm regards Dr Govind Suresh Mittal.