Your wound should be fully healed, meaning that it is not bleeding or scabbed. A new layer of skin should be formed when you start using ESTAS. Depending on the nature of the wound this is a broad range of time. For a minor scrape your scar could be ready within a couple of days, for a major cut, incision or burn, it could take as long as 4 to 6 weeks. If unsure, always consult your doctor before starting your scarcare routine.