The causes of long spots on men’s face mainly depend on the type of spots, which may be related to heredity, ultraviolet irradiation, skin aging and other factors, and the more common ones are chloasma, freckles, age spots and so on. 1. Melasma: The formation of melasma is related to heredity to a certain extent, and it is also related to ultraviolet radiation. Long-term ultraviolet radiation will cause the activation of melanocyte function, which will also damage the epidermal barrier and increase the release of inflammatory cells, stimulating the formation of melanin, resulting in the emergence of melasma. 2. Freckles: Freckles are also a kind of pigment disorder skin disease, the cause of which is related to heredity. In addition, prolonged exposure to sunshine will make the melanin form in the skin bigger and enhance the ability to produce melanin, which will deepen the color of pigmentation spots and increase their number. 3. Age spots: age spots are benign tumors of epidermis, this disease is common in older patients, and the aging of the skin has a certain relationship, in addition, there are also certain genetic factors, in addition to the ultraviolet ray for a long time, viral infections, tumors, and some medicines and air pollution, etc. will also induce age spots. It is recommended to go to the hospital for a detailed examination to clarify the type of spots and treat the symptoms.