referring now to fig1 a and 13 b an embodiment of the present invention is shown with fig1 a representing a top view and fig1 b representing a side view as shown in fig1 a and 13 b dressing 10 of a final shape substantially similar to the embodiments of fig1 through 12 is formed of two optionally linked subunits lower portion 300 and upper portion 400 fig1 a illustrates a top view of dressing 10 prior to installation dressing 10 comprising two foldably linked portions lower portion 300 having circular cut 320 and slit 310 and upper portion 400 having a surface trench or channel 410 lower portion 300 is foldably linked to upper portion 400 at the linking area 330 fig1 b shows an assembled dressing 10 with upper portion 400 folded at linking area 330 and positioned on top of lower portion 300 with percutaneous medical device or catheter 100 not shown the resulting dressing 10 assembled of lower portion 300 and upper portion 400 is substantially similar to dressing 10 as shown in fig1 through 12 in use as shown in fig1 a and 14 b lower portion 300 is installed on percutaneous medical device or catheter 100 with the circular cut 320 surrounding the catheter and slit 310 going around and under the catheter 100 percutaneous medical device or catheter 100 can be positioned aligned with slit 310 as shown in fig1 a or angular to slit 310 such as perpendicular to slit 310 as shown in fig1 b with surface trench or channel 410 being also perpendicular to slit 310 advantageously angular positioning of percutaneous medical device or catheter 100 relative to slit 310 further improves the.