Are lasers effective on removing spider veins?

Only the tiniest : The "gold standard" still is sclerotherapy, but lasers are becoming more effective and with less side effects, if performed by an expert in laser therapy, but can be more costly. Sclerotherapy requires skill and precision as well, but has a very low side effect or risk profile, and can work on small to medium spider veins. Larger varicosities will require surgery or endovenous approaches.

Yes: The smaller the spider vein the easier to treat.

Very effective.: If your skin type is between 1-3, that means white caucasian , not vey dark skin it works well. But for very dark or black skin type not recomanded.

Yes...: Especially on the face. Sclerotherapy generally works better on the legs, as dr. Tholen said.

Vein evaluation.: If you have a few spider veins then sclerotherapy would be the treatment of choice. If you have many spider veins then you should consider having a venous evaluation with a venous reflux ultrasound to see if you have underlying reflux (leaking vein valves) which may be the cause of the spiders. Skin lasers do not work well on spider veins in the legs.