The process of removing thread veins is called sclerotherapy. Your consultant may use a series of small, virtually painless injections into the affected area. The chemical used will cause the vein to become sticky and eventually close off. At first the vein may look bruised but it will soon fade and disappear. 

In some cases a laser can be used, causing the veins to close up and eventually disappear. Please note that laser treatment may not be available at all hospitals.