More and more freckles on the body may be caused by sunlight exposure and endocrine factors. 1. Sunlight irradiation: freckles are a kind of common brown dotted pigment spots, the occurrence of which is related to genetic factors. Prolonged exposure to ultraviolet rays will induce the disease or aggravate the condition, resulting in more and more freckles, which need to be improved by corresponding means of sunscreen. 2. Endocrine factors: after children and adolescents, the gradual change of hormones in the body will cause the activity of melanin cells. For example, for women with freckles, the increase of oestrogen will enhance the ability of synthesizing melanin, which will further deepen the skin pigmentation, thus causing more and more freckles. When more and more freckles appear on the body, it is recommended to go to regular hospitals in time to find out the causes and follow the doctor’s instructions to standardize the treatment.