I fished up a photo from the internet of a patient that had FUE grafts in the frontal recipient area. Two things worth noticing: (1) the grafts are elevated and (2) there is skin in the graft that is as wide as the graft itself.
The skin will survive the transplant and the elevation will produce small, subtle white elevated bump surrounding each group of hair from the recipient area (called cobblestonning) and I believe that is what you may be seeing.
I do this differently than the doctor who did the patient in the photo, as I trim off the skin of the grafts before placing them and then place the grafts flush with the surrounding skin so that these white area are not present in our grafts. Click on the photo to enlarge it.