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How does sclerotherapy treat spider veins?

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How does sclerotherapy treat spider veins? Spider veins are small collections of veins just underneath the skin which are a consequence of chronic venous hypertension. Sclerotherapy is the use of a mild detergent or sclerosing drug which injected into the vein, flushes out the blood and then causes the vein to collapse on itself scarring it down which gives the appearance that the spider vein then disappears.

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