What can cause the sudden appearance of spider-veins, and what can make them go away

Spider veins do not occur quickly but are often not noticed until they are noticeable. They are a result of venous insufficiency which can be the result of heredity, sun exposure, age, obesity, jobs that require a lot of standing or walking and hormones.

Treatment includes:

injections to seal off the veins (sclerotherapy)

laser surgery

radio frequency and laser (endovenous techniques)

surgery

If you are looking for a non-medical or non-surgical option, the only one that exists is leg makeup.