Pale skin is sign of Iron Deficiency Anemia.

The most typical signs of anemia are pale skin.
A common symptom associated with iron deficiency is pale skin. As your iron levels are depleted, your body is unable to manufacture the chemical hemoglobin, a reddish compound, which is an essential part of red blood cells. When this occurs, you develop a condition called iron deficiency anemia. As anemia worsens, your skin begins to lose its normal color and become pale. If you notice that your skin is paler than usual, consult a doctor and ask about iron deficiency and anemia.