Dry skin typically needs moisture to help keep it moist and healthy. The same is true for cold sores. So to create a dry, warm, and safe environment, dry foam dressing is used. In most cases, the skin around the wound will be slightly damp, but it should never be wet. Dry, warm, and safe do not always mean the same things as waterproof, although foams do have properties that allow them to maintain their form when applied to the skin and keep them from drying out. Most doctors' first instinct is to rush their patients into topical creams and ointments that say they're waterproof and will prevent any sort of infection, especially in open wounds like those from herpes. There are many different types of exuding materials, although none of them are truly waterproof, and all of them have varying degrees of impermeable properties.
So while some foam dressings may help the wounds dry out quicker, others can actually encourage infections by promoting the growth of bacteria and fungus. The best topical treatments for this condition are those that are made with pharmaceutical-grade oils or petroleum-based moisturizers. First, the bandage will be kept somewhat moist.
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