This sounds like a vien. No intervention is needed

Based on what you saw and reported, these painless visible veins on the penis and sac are likely harmless to you, but represent an individual anatomical variation. Yet, for the time being, a wait-watch-and-see approach would be the reasonable thing to do. In addition, what should one do if one feels something wrong or sick? To prepare a potential patient to work with the doctors so as to achieve the best possible medical care, I would advise you to take time to read "Sick, What To Do?" in http://formefirst.com/eNewsletter06.html

Best wishes for your health, happiness, and bright future.