Small blood blisters on the outer skin of the testicular scrotum may be caused by clothing friction, capillary hyperplasia, and scrotal eczema. 1. Clothing friction: small blisters caused by friction due to wearing inappropriate underwear. It is recommended to change underwear in time, wear loose and breathable clothes, and carry out anti-inflammatory treatment in time. Drink more water, avoid spicy diet, pay attention to rest. 2. Capillary hyperplasia: due to the expansion of the capillaries in the epidermis of the scrotum caused by vascular aggregation leading to hyperplasia, thus causing small blood blisters on the epidermis of the testicular scrotum, can follow the doctor’s instructions to use the polysulfonic acid mucopolysaccharide cream, erythromycin ointment and other drugs. 3. Scrotal eczema: mostly caused by local dampness and elevated temperature. You should pay attention to rest, pay attention to local cleanliness and hygiene, change underwear and panties. When the symptoms are serious, you can follow the doctor’s instructions to apply compound dexamethasone acetate cream, Dinaid cream and other drugs to relieve the symptoms, and at the same time, use potassium permanganate topical tablets for cleaning. Small blood blisters on the outer skin of the testicular capsule can also be seen in other causes, it is recommended to go to the regular hospital in a timely manner, to clarify the cause of the disease, and then follow the doctor’s instructions for treatment.