As previously mentioned by a colleague above, medical literature solidly shows that the results of sclerotherapy are improved if the patient wears compression stockings in a compliant fashion.
There is a wide variety of options available and it can be over whelming which is why most clinics do provide a fitting service. In which they can help you navigate the best style and brand along with ensuring it is the correct size. The most important variable however is strength of compression.
Following varicose veins procedures such as Endovenous Laser Ablation, Radio Frequency Ablation and Ultrasound Guided Sclerotherapy I advocate the use of Class 2 30 mmHg strength stockings. These are almost always thigh high to ensure compression on the entire leg.
For direct vision or microsclerotherapy on spider veins or reticular veins our clinic still predominately uses 20-30 mmHg however we have the option of knee high stockings and less firm 15-20 mmHg strength for small areas of treatment.
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