Spots can generally be categorized into chloasma, freckles, brownish-bronze nevus, nevus of Ota and seborrheic keratosis, etc. Different causes and clinical manifestations of spots are different. Different spots have different causes and clinical manifestations. 1. Melasma: Melasma usually occurs in middle-aged women and worsens in summer and decreases in winter. It may appear as butterfly-shaped patches on cheeks or cheeks. 2. Freckles: Freckles usually develop in childhood and become obvious in adolescence. It manifests itself as pinpoint to rice grain-sized spots scattered on the nose and cheeks, with clearer borders. 3. Brownish-bronze nevus: Brownish-bronze nevus (dermatomal spot) on zygomatic area mostly occurs in women, the age of onset is mostly in 16-40 years old, and some patients have family history. It manifests as symmetrically scattered round, grayish-blue patches on zygomatic and temporal areas, with relatively clear borders and without any conscious symptoms. 4. Nevus of Ota: also known as brownish-bronze nevus of the palate and melanocytic hyperplasia of the eye skin, usually appearing in infancy and childhood, with blue-gray or grayish-brown spots on the zygomatic area, temporal area, nose, etc., with unclear borders; the color of the spots often deepens with the growth of age, and there are occasional nodular manifestations in the spots. 5. Seborrheic keratosis: Seborrheic keratosis usually occurs in middle-aged and old people. It is a common benign skin tumor associated with heredity or long-term exposure to sunlight and other factors, preferably in exposed areas, manifested as flat papules or plaques slightly above the skin surface. For patients with skin spots, it is recommended to go to regular hospitals for timely examination, clear diagnosis, and standardized treatment under the guidance of professional doctors.