Men with red spots on the skin vessels of the testicles are considered to have red spots on the skin vessels of the scrotum, which may be caused by skin allergies, eczema, jock itch, purpura and other diseases. 1. skin allergy: for example, contact dermatitis, drug rash and other causes of skin allergic reactions, may cause scrotal skin vessels with red spots. 2. Eczema: Inflammatory skin reactions caused by a variety of other factors may also lead to scrotal skin with red spots, itching and other symptoms. 3. ringworm: fungal infection caused by perineal epidermal ringworm disease may also lead to scrotal skin vessels with red spots, some may also cause skin erythema, flaking. 4. Purpura: various causes of purpura cause subcutaneous capillary rupture, can also lead to the appearance of scrotal skin vessels with red spots. Scrotal skin vessels with red spots, there may be other reasons, you need to go to the hospital in time to diagnose the cause of the disease, active treatment.