Sclerotherapy or Thermavein is a form of treatment where a practitioner injects medicine into blood vessels or lymph vessels that causes them to shrink. It is commonly used to treat spider veins. The procedure is non-surgical, requiring only an injection.
People with spider veins should consider sclerotherapy when:
the veins are painful
the legs are sore or feel heavy
the skin on the legs or feet is patchy or dry
there is a rash near the veins