Atopic Dermatitis has a number of characteristic symptoms, including itchy red spots and acute rashes that can ooze fluid and/or crust over. Currently, no cure exists as the fundamental cause of Atopic Dermatitis is not yet known. In this paper, the author reports on a case study in which Atopic Dermatitis patients are successfully treated by way of sweating. The described treatment method, called Poison Extraction Method, takes advantage of medical benefits of perspiring in hot bath or sauna. It assumes that the chronic symptoms suffered by Atopic Dermatitis patients are largely due to overuse of steroid-based ointments and attempts to extract resulting toxic elements by having patients sweat in either a hot bath or sauna or both. The exact prescription for sweating depends on the severity of the symptoms of individual patients. The described treatment has been successfully tested in a clinical trial, which we report in this paper.