Dermaplaning does not cause vellus hair/peach fuzz to grow back darker or fuller. The dermaplaning/dermablading process cuts those hairs at a deeper level than shaving does; however, it doesn’t affect the hair follicle itself, and it has no effect on hair growth.
Because the results of dermaplaning are temporary, your vellus hair will grow back—but at the same rate, color, and texture as normal, regardless of the number of times you enjoy dermaplaning.