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Some pain or burning at the needle injection site may occur, however, most people find it a relatively painless treatment.
For 3 weeks or so the area treated may be red - occasionally this lasts for 5 or 6 weeks.
Complications are extremely rare, according to the manufacturer, and there appears to be little risk of scarring following treatment. Scarring can occasionally be a problem with other treatment options.
Occasionally you may also find new veins developing in the treated areas, or even old veins flaring up again.