Answer:
Piebald spotting is caused by an inability of pigment-producing cells to migrate properly during development. This condition is usually inherited, and it results in patches of unpigmented skin. In some cases, two adults with piebald spotting may have a child who has this characteristic and a second child with normal skin pigmentation. This happens because the genetic trait responsible for piebald spotting is a recessive trait. In other words, the child must inherit two copies of the recessive gene in order to display the trait. If the child only receives one copy of the gene, they will not exhibit piebald spotting.