AniSo

I have a patient with a small leg wound/ulcer r/t his dx bullous pemphigoid (a rare skin condition causing blisters). He was sent home with orders to clean with NS and apply a silicone foam non-bordered dressing (it was adhesive) and to change Q3 days. I don't think the wound is healing. The skin around wound is starting to get macerated and starting to peel superficially around the edges. What are other dressing could I use, definitely something nonadhesive. I was thinking maybe non-adhesive telfa and wrap with kerlix or cohesive wrap? How often do you change a telfa dressing? or maybe i could just use a non-adherent optifoam? The amount of drainage is minimal serosanguineous. I am not a wound specialist and still am learning about the types of dressings available, so any help or suggestions will help.