Small black spots like moles on the face may be caused by seborrheic keratosis, chloasma, nevus of Ota, freckles and other diseases. 1. Seborrheic keratosis: The cause of seborrheic keratosis is mainly related to skin aging and hereditary factors, etc. Patients will have multiple dark spots and pimples of varying sizes, which are dark brown or black in color, and are commonly found on the head, face and neck. 2. Melasma: the formation of melasma may be related to genetic susceptibility, ultraviolet radiation and endocrine factors, etc. The clinical manifestation is light brown to dark brown spots or patches, which are mostly seen on the face. 3. Nevus of Ota: the cause of nevus of Ota may be hereditary and other factors, and the lesions of the patients are mostly seen on the face, mostly in the form of blotchy, reticular and so on, which are grayish-blue, greenish-gray and black in color, and so on. 4. Freckles: The causes of freckles are mostly related to heredity, light and other factors, and the disease occurs in the face and other places, with lesions of pigmentation spots of the size of a needle tip to a grain of rice, and the color ranging from light brown to dark brown. The causes of small black spots like moles on the face are not unique, so it is recommended that patients seek medical examination to clarify the causes of the disease.