There are several possibilities: 1, vitiligo: If it is vitiligo, you can use 0.03% tacrolimus ointment topically; 2, anemic nevus or pigmented nevus: If it is anemic nevus or pigmented nevus, it can be temporarily observed and not treated if it does not get bigger, if it gets bigger, it can be treated by surgical treatment program; 3, simple pityriasis: If it is simple pityriasis, it can be treated by topical application of boric acid zinc oxide ointment or vitamin E cream. Generally accompanied by flaking, can be treated with topical boric acid zinc oxide ointment or vitamin E cream. White furuncle can also strengthen the treatment on the diet, more to the child to eat some vitamin-rich food, such as fruits and vegetables, and sun protection. Differentiation between them can be done with Wood’s lamp and skin CT for differential diagnosis.