Cosrx Master Patch Basic – Pimple Cover 36 Patches, these clear stickers are like little invisibility shields for pimples. They work their magic while you sleep, calming redness and soaking up extra oil. The tea tree oil within soothes irritation and helps prevent you from picking, which should be avoided. Wake up to clearer, calmer skin! These are a 12mm size patch. How to use After cleansing, dry the problematic spot. Stick it on gently and let it heal. Goodbye pimple