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. This 3-week waiting period 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 both of the arms with a regimen of washing with Dial liquid antibacterial soap, followed by wiping the arm with sterile gauze soaked with 70%, then 80% alcohol. Once the alcohol has dried, a thin coat of the subject's individualized AMT cream will then be applied to each arm by the gloved hands of a study coordinator. Five minutes after applying the cream, a quantitative washing will be performed on eczematous skin of one antecubital fossae, as well as on a non-lesional area of skin on the 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 at the same site and the fluid pooled together. The pooled fluid will be analyzed in the lab via colony counting methods to determine the number of viable bacteria colonies on the skin surface. A skin swab of both lesional and non-lesional skin will then be taken. This will conclude the treatment visit. We expect this visit to take approximately 30 minutes.