COSRX - Acne Pimple Master Patch 1. Select patch (7mm, 10mm, 12mm) according to size of trouble area. 2. Tear patch from protective film and apply on the problem spot. 3. Make sure your skin is clean. Do not apply any essence or lotion beforehand. 4. The patch may turn white and swell due to absorption of exudation. If this happens, replace with a new patch. Compare prices from: Cosrx in Body Care