There is no special reason for men to have long black spots, which may be related to endocrine disorders, skin aging, bad habits, external stimuli and disease factors: 1. With the growth of skin, the metabolism of skin declines and the natural repair ability of skin stratum corneum decreases, which makes the pigmentation difficult to fade and turn into black spots; 3, bad living habits: frequent consumption of pigmented products, such as carbonated drinks, fried and hotpot food, or frequent late night and mental stress, etc. can easily lead to the growth of black spots on the face. External stimulation: 1, often exposed to the sun or artificial light: if the facial skin is exposed to the sun for a long time, direct exposure to ultraviolet radiation without shielding, it is easy to cause pigmentation and make dark spots on the face; 2, friction stimulates the skin: scratching certain parts for a long time may accelerate the generation of melanin and cause pigmentation. The most important thing is that you can get a good idea of what you’re looking for. constipation, resulting in toxins not being excreted from the body, pigmentation may appear on the skin; 5. Decreased liver function: long-term smoking, alcoholism, taking liver-damaging drugs, which may lead to abnormal liver and kidney function, skin pigmentation and dark spots.