Experiment 3 will consist of 6 office visits (Screening, Culture, Treatment, and 3 Follow-up visits), as well as one phone call to relay eligibility information. All office visits will occur at the UCSD Dermatology Clinic. Subjects who have participated in Experiment 2 must wait at least a period of time equivalent to 10 half-lives of the AMT cream before beginning the study procedures of Experiment 3. The Screening, Phone Call, and Culture Visits for Experiment 3 are the same as for Experiment 1. The Treatment Visit and Follow-Up Visits differ slightly from those in Experiment 1 and will be described below, with changes underlined.