Treatment Visit (Day 28 +/- 7) Eligible subjects with + S. aureus screening cultures will be enrolled in the study and instructed to return to the clinic approximately 28 days after their screening visit for the treatment visit. This 3-week waiting period between the culture and treatment visits will allow laboratory staff to grow and prepare the subject's endogenous AMP-producing bacteria to be mixed with Cetaphil for application at the treatment visit. To simulate real-life scenarios as much as possible, the subject will be allowed to continue their usual activities during this study, including bathing, showering, and exercising. This visit will begin by reviewing the subject's interim medical history, including medication history to ensure that he/she did not use any topical AD treatments on their arms within 7 days or oral AD treatments within 28 days of this visit. For subjects who had a S. aureus (+) nasal culture at screening visit, a repeat nasal culture will be performed. For all subjects, a focused physical exam will then be performed of the subject's bilateral arms to ensure that there is no evidence of cracks, breaks or infections of the skin on the arms. Next we will pre-treat one arm with a regimen of washing with Dial liquid antibacterial soap, followed by wiping the arm with 70% followed by 80% alcohol using sterile gauze. Once the alcohol has dried, a thin coat of the subject's individualized AMT cream will then be applied to one of the subject's arms by the gloved hands of a study coordinator. Five minutes later, a quantitative washing will be performed on eczematous skin of the antecubital fossae of the arm treated with the AMT cream, as well as on an area of non-lesional skin on this same arm. For each wash, a sterile stainless steel cylinder with an approximate area of 3.5 cm2 will be held firmly to the skin surface, and 2.5 mL of a sterile stripping fluid (SSFN) will be carefully instilled into the cylinder. The skin will then be massaged for 60 seconds using a sterile rubber policeman. The SSFN will be aspirated with a pipette and transferred to a sterile test tube. This entire process will be repeated a second time and the fluid pooled together. The pooled fluid will be analyzed in the lab via PCR to determine how many and what type of bacteria are present. A skin swab of lesional and non-lesional skin will also be completed. Subjects will then be given single-use aliquots of their own AMT cream and gloves to take home with them. They will be instructed to apply one of the aliquots to the same arm it was applied to during the treatment visit at a dosing interval determined based on the half-life calculated from the results of Experiment 1 for a total of 6 doses (the dose schedule predicted to achieve steady state). They will be instructed to wash their hands and put on gloves prior to each application of the cream. This will conclude the treatment visit. We expect this visit to take approximately 30 minutes.