Spots on forehead area can be seen in melasma, age spots, nevus of Ota and other diseases, the causes of which are mainly related to heredity, endocrine disorders, ultraviolet irradiation, aging and other factors. 1. Melasma: it is a kind of yellowish-brown pigmentation spot occurring on the face, the causes of which are mainly related to heredity, ultraviolet irradiation and endocrine disorders. 2. Age spots: also known as seborrheic keratosis, occurring on the face and the back of the hands of middle-aged and old people, the causes of its onset are related to skin aging, heredity, sun exposure and other factors. 3. Nevus of Ota: It is a pigmentation disease, with greenish gray or blackish patches, and it occurs on the face. The cause of the disease may be related to heredity. Due to individual differences in clinical manifestations, it is necessary to consult a doctor for details.