A three-year-old child with three brown spots on the bridge of his nose may be caused by freckles, pigmented nevi and other factors. 1. Freckles: Freckles have obvious family tendency and the causes mainly include heredity and sun exposure. Influenced by hereditary factors, brown dots may appear on the bridge of the nose around the age of three to five in childhood. Freckles will not affect the health of the body, so it is recommended to observe closely and pay strict attention to sun protection when going out. 2. Pigmented nevus: Pigmented nevus is a benign skin tumor composed of nevus cells, which may occur from infancy to old age. As the number increases with age, skin surface growths of varying size, color and shape may appear on the skin surface. Three brown dots appearing on the bridge of the nose of a three-year-old child are recommended to be closely observed if there are no symptoms. If there are other uncomfortable symptoms such as itching and pain, you can go to the dermatology department of the hospital to find the cause.