You are probably thinking of Vitiligo. It's a skin disease not exclusive to Black people, but people of many skin tones can acquire it and exhibit splotches of white.
It can be vitiligo, a skin condition that reduces melanin, leaving white spots. This is the disease that Michael Jackson had and covered with makeup. White spots can also be the result of burns.
white spots are mostly seen in the aged women. These white spots are also seen in babys skin. it is because of vitamin deficiency. applying vasline and eat nutritional food is the remedy.