You have recipient area necrosis which means that the skin in the black areas you see has died. These crusts will eventually fall off, many times showing red granulation tissue which will close over time.  My team has done over 16,000 surgeries and have never seen a single case of this. This means that either the grafts were placed too closely together, the instruments were too large, or both.

Screen Shot 2018-09-25 at 3.28.47 PM