Injection sclerotherapy is widely used for superficial varicose veins. The treatment aims to obliterate the lumen of varicose veins or thread veins. There is limited evidence regarding its efficacy.
Tisi, P. V., Beverley, C., & Rees, A. (2006). Injection sclerotherapy for varicose veins. Cochrane Database of Systematic Reviews. https://doi.org/10.1002/14651858.cd001732.pub2