No, the veins that disappear can’t come back. They disappear briefly when the saline flushes the visible veins, and then blood flow returns. But over the next few weeks those veins shut down. If you knock them down you’ll have a good result, and might look like you are “cured,” but most people tend to get new ones over time. Our treatment, then, is not a lifetime warranty for disappearance of spider veins. That said, most patients get a good result and are happy we treated them!