Long spots on both sides of men’s cheeks may be related to melasma, post-inflammatory hyperpigmentation spots or seborrheic keratosis, etc. The causes of the disease include hereditary factors, aging, ultraviolet irradiation, infection, and so on. 1. Melasma: It is a yellowish-brown pigmented spot on the face caused by many factors, the main causes of which include heredity, ultraviolet radiation and hormone level in the body. 2. Post-inflammatory hyperpigmentation spots: due to the healing of local inflammatory skin diseases, resulting in skin hyperpigmentation. 3. Seborrheic keratosis: it refers to the light brown papules occurring on the face, upper limbs, neck and other parts of the body, which are benign epidermal tumors, and the causes of the disease are related to ageing, ultraviolet radiation, heredity and other factors. As there are more reasons leading to spotting in men, it is necessary to ask the doctor for an interview for specific cases.