The hardness of the testicular skin is also known as scrotal skin hardness, which may be caused by scrotal inflammation. The scrotal skin of men is relatively low in temperature and humid, which can easily induce infection. Consider also whether the scrotum has been traumatized, because after trauma local skin scars form and local hardness appears, which will improve with time. It should also be ruled out that the scrotum is caused by malignant skin tumor lesions, because malignancy causes poor local blood circulation, resulting in focal sclerosis, and even the entire scrotum can become sclerotic, which is a bad symptom, and requires timely medical consultation, through facial examination, tumor index examination, and other related examinations to confirm the diagnosis and early treatment.