Veins are categorized as small, medium or large. In general, veins appropriate for sclerotherapy are either small or medium. Spider veins, the small red or purple veins on the skin surface, are the most common types treated by sclerotherapy. With the use of new techniques (foam) and new solutions (recently FDA approved) medium sized veins also may be treated with sclerotherapy. Not every vein can be treated: larger, bulging varicose are treated with other technologies and techniques.
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