Compeed Cold Sore Discreet Healing patch contains hydrocolloid active gel technology for fast healing and a reduction in scabbing. It starts to work from the very first sign and continues throughout all stages. Its’ Hydrocolloid-075 active gel technology creates the optimal germ-free healing environment to help prevent the scab forming and the cold sore from spreading. The patch is discreet and also acts like a virus shield to help reduce risk of contamination from the cold sore and to prevent it from worsening. Stays in place for up to 12 hours.