Silicone Scar Sheets should be used for at least eight weeks and perhaps longer. Each sheet should be worn on the scar for at least 12 hours per day, and for ease of use, they can even be worn for up to three to four days at a time and overnight. Scar sheets should not be used on wounds that are still open, have sutures or stitches or on fragile or unhealed skin. Some patients may experience a rash or allergic reaction. If this occurs, you should stop using the product and call our office.