Synera Venipuncture Pain

All subjects will receive 2 patch applications during this study: one Synera, one placebo. The 2 patch applications must be done on separate days. Only 1 patch will be used per application. Arm 1 subjects will receive Synera patch for the 1st application, and placebo for the second. Arm 2 patients will receive placebo patch for the 1st application, and Synera patch for the second.