Men’s waist skin darkening may be caused by improper dressing, trauma or sun exposure. 1. Improper clothing: If you wear tight clothes and pants for a long time, resulting in long-term friction of the waist skin, resulting in pigmentation, it will cause the male waist skin blackening. 2. Trauma: If the waist is subjected to direct violence, resulting in subcutaneous bleeding of the waist skin, with the development of time hemoglobin changes, it will show subcutaneous purple, subcutaneous black state. 3. Sun exposure: If the male waist skin is exposed to sunlight for a long time, it will also cause the part of the pigmentation, appearing waist skin blackening. If men’s waist skin darkening situation, and accompanied by other uncomfortable symptoms, it is recommended to go to the hospital in a timely manner for examination and diagnosis, as soon as possible to clarify the cause of the disease to take positive intervention measures, to avoid delaying the condition caused by the aggravation of the symptoms of a serious impact.