Freckles on children’s face are mainly related to genetic factors and sunlight exposure. Freckles will not affect their health, and if they are conscious of the effect on their aesthetic appearance, they can consult a doctor in time for treatment. 1. Genetic factors, i.e. the occurrence of freckles has obvious family aggregation phenomenon, and it is usually considered that freckles is a kind of pigmentation disease related to autosomal inheritance, and the genetic factors are the main reasons for the occurrence of freckles. 2. Sunlight irradiation, long-term sunlight irradiation is a necessary factor for the occurrence of freckles. After irradiation by sunlight and ultraviolet rays, freckle lesions will increase in number, deepen in color, and become bigger in shape, etc. And freckles usually occur in spring and summer. And freckles usually worsen in spring and summer, and decrease in fall and winter. The occurrence of freckles may also be related to age, region and living environment.