FAST HEALING: ultra-thin hydrocolloid gel provides a moist environment to help reduce scab formation , ACT LIKE A SHIELD: provides a protective barrier against external environment, helping to reduce the risk of contamination COMPEED Discreet Healing Cold sore patch contains hydrocolloid gel for fast healing and to help reduce scab formation. It starts to work from the very first sign and continues throughout all stages to help stop the cold sore worsening. The patch creates a virus shield to help reduce the risk of contamination. Its discreet design helps protect the cold sore and avoid social embarrassment.