Shrooms will make zero difference to the healing time, as long as you make sure not to interfere with the wound while tripping (basically, don't do anything that would interfere with the healing time if you did it sober).
Depending on the size of the wound and how it's been treated it might be advisable to wait until you are more healed, if there is a risk, for example, that the bandage will come off, move, or if you are experiencing any pain that might affect your trip, so use your judgement in that regard. But there is no biological reason that there would be any effect on the healing process.