The only treatment is laser or scleroplasty (not sure about spelling). Go see the doctor and they will advise you what are the best option for your veins (everyone is different).
To prevent the appearance in future, this is what helps me:
- keep your weight steady, do not gain any extra pound as it encrease pressure on your legs.
- after each shout, rinse your legs with ice cold water ( as cold as you can tolerate)
- before go to bed, put your legs on the wall, at 90 degrees, and hold them for a little bit 5-10 min
- if you have to stand for a long time, wheat compression tights.
- take extra care of your legs when you start experiencing slight discomfort or pain - this is when the damage happens. Once vein popped up, it is painless, but it is also too late to do anything without dr's involvement
- stretch your legs often. Just find some yoga poses for legs and do it daily.