In our opinion there should not be a problem after 4 weeks, however if there is an injury such as a deep laceration you might want to have it looked at by a reputable hair restoration surgeon that can use magnification such as "loupes" to put your mind at ease. Let us know what the outcome is.
If all of the crusts were off, I would doubt that you would have dislodged grafts. You can go back to see your doctor and get examined to find out if you are very concerned.