Blood blisters on the scrotal skin may be caused by localized injuries that lead to bleeding, or they may be caused by hemangioma of the scrotal skin or inflammation of the scrotal skin. 1. Scrotal skin that is traumatized, burned, rubbed, etc. can lead to breakage of the surface skin of the scrotum, which is prone to blood blisters. 2. The capillaries of the scrotal skin can develop tiny hemangiomas, which can lead to the appearance of multiple small blood blisters on the surface of the scrotal skin, mostly purple-black in color and easy to rupture and bleed. 3. Inflammatory stimulation of the scrotal skin will lead to capillary dilation, easy to appear small blood blisters, usually accompanied by pain or itching of the scrotal skin. Therefore, when blood blisters appear on the scrotum skin, it is best to go to the hospital to check the specific cause of the disease, and then give appropriate treatment.