Final answer:
Pigment granules scattered throughout the cell give color to the skin, but if the granules are concentrated tightly at a spot, they may not affect the skin color.
Step-by-step explanation:
When pigment granules are scattered throughout the cell, the cell as a whole takes on the color of the granules and imparts that color to the skin. When the granules are concentrated tightly together at a tiny spot in the center of the cell, the color of the granules may be essentially invisible and exert hardly any effect on the color of the skin.