Paleness may be the result of decreased blood supply to the skin. It can also be due to decreased number of red blood cells (anemia). Paleness of the skin is not the same as loss of pigment from the skin. Paleness is related to blood flow in the skin rather than deposit of melanin in the skin
Tell the man to take a break and to eat or read a book. Don't go on any devices because it will distract him and cause more stress. He needs to tell himself that sometimes it's good to take a break and he already has amazing grades.