A system for providing a force to a treatment area on a patient comprising: a dressing assembly for placing on the treatment area comprising: a longitudinal portion with a first end and a second end, a dressing bolster having a first surface, a second inward-facing surface, and a side area, and an envelope member (440, 446) surrounding the dressing bolster, wherein the envelope member comprises: an interior surface member having a first surface and a second, inward-facing surface, wherein the second, inward-facing surface of the dressing bolster is disposed against the first surface of the interior surface member, and an exterior surface member having a first surface and a second, inward-facing surface, wherein the second, inward-facing surface of the exterior surface member is disposed proximate the first surface of the dressing bolster; and a sealing subsystem for providing a fluid seal over the dressing assembly, characterized in that the sealing subsystem comprises: an over-drape that extends over the exterior surface member and is attached to the side area of the dressing bolster; and a sealing apparatus for providing a fluid seal over a person's epidermis and the over-drape. a dressing assembly for placing on the treatment area comprising: a longitudinal portion with a first end and a second end, a dressing bolster having a first surface, a second inward-facing surface, and a side area, and an envelope member (440, 446) surrounding the dressing bolster, wherein the envelope member comprises: an interior surface member having a first surface and a second, inward-facing surface, wherein the second, inward-facing surface of the dressing bolster is disposed against the first surface of the interior surface member, and an exterior surface member having a first surface and a second, inward-facing surface, wherein the second, inward-facing surface of the exterior surface member is disposed proximate the first surface of the dressing bolster; and a longitudinal portion with a first end and a second end, a dressing bolster having a first surface, a second inward-facing surface, and a side area, and an envelope member (440, 446) surrounding the dressing bolster, wherein the envelope member comprises: an interior surface member having a first surface and a second, inward-facing surface, wherein the second, inward-facing surface of the dressing bolster is disposed against the first surface of the interior surface member, and an exterior surface member having a first surface and a second, inward-facing surface, wherein the second, inward-facing surface of the exterior surface member is disposed proximate the first surface of the dressing bolster; and an interior surface member having a first surface and a second, inward-facing surface, wherein the second, inward-facing surface of the dressing bolster is disposed against the first surface of the interior surface member, and an exterior surface member having a first surface and a second, inward-facing surface, wherein the second, inward-facing surface of the exterior surface member is disposed proximate the first surface of the dressing bolster; and a sealing subsystem for providing a fluid seal over the dressing assembly, characterized in that the sealing subsystem comprises: an over-drape that extends over the exterior surface member and is attached to the side area of the dressing bolster; and a sealing apparatus for providing a fluid seal over a person's epidermis and the over-drape. an over-drape that extends over the exterior surface member and is attached to the side area of the dressing bolster; and a sealing apparatus for providing a fluid seal over a person's epidermis and the over-drape.