These are scabs (crusts) from the recipient site grafts. They should have been washed off within the first day and the following day after the surgery.
Now, you must wait 12 days to remove them. You should leave shampoo on the area for 10 minutes then gently rub it with your fingertips. As the scabs loosen, they will come off slowly. Repeat this twice a day until they come off. Don’t pick them off.