Freckles are common yellowish brown or dark brown spots on the face, which are caused by autosomal dominant inheritance, and most of them still have family history. Excessive sun exposure can aggravate or induce diseases. It may be an area prone to freckles. There is a special type of melanocyte in epidermis, which is controlled by genetic factors and forms melanin under ultraviolet irradiation. A special kind of freckles is freckles with pigmented nevus. The treatment of freckles does not require treatment. Avoid or reduce sunlight, and use sunscreen when going out, such as titanium dioxide cream or p-aminobenzoic acid cream.