DuoDerm Signal - Oval Hydrocolloid Dressing with Border helps exuding wounds heal by creating a moist environment. It also removes dead tissue from the wound without damaging new tissue. The dressing is flexible and can be molded into place to fit the size and shape of your wound. DuoDerm CGF has an indicator that visibly shows when it is time to change the wound dressing. The adhesive border tapers at the edges, which prevents the dressing from rolling or bunching.