Since the picture shows whitish discoloration of the skin on a child's face, the condition is known as HYPOPIGMENTATION... And is seen on: [1] TINEA VERSICOLOR [most common & my Dx], [2] PTYRIASIS ALBA - also with hypopigmentation, [3] LEUKODERMA (beginning), [4] start of VITILIGO, [5] NEVUS DEPIGMENTOSUS, [5] LEUCISM, [6] WENDE- BAUCKUS Syndrome, [7] WAARDENBURG syndrome, [8] POST-INFLAMMATORY HYPOPIGMENTATION, [9] IDIOPATHIC HYPOMELANOSIS, and other HYPOPIGMENTED diseases...