Good question. Rob asked me one a couple years back which approached the same answer from the other side: "underneath" the story, I use the game mechanics as much as possible to model what Doug's power does. Since pretty much all damage in V&V is expressed in terms of hit points (including the effects of disease) and since Kick-Ass is long since healed from the injuries that gave him his "power" (meaning he has a new "base state" that having all his hit points reflects), any healing Doug's power does will only restore him to his body's current "full health" state, and not "undo" any previous healing to return him to an earlier "full health" state.
tl;dr version: No.
-- Bob
---------
Then the horns kicked in...
...and my shoes began to squeak.
tl;dr version: No.
-- Bob
---------
Then the horns kicked in...
...and my shoes began to squeak.