Sclerotherapy injection

Is there a procedure like an injection for varicose veins?

I'm not sure about the exact details, but...

If an injection procedure is performed on the area with varicose veins

The protruding vein is said to go back in and disappear.

I'm wondering if it's temporary or a simple procedure.

I want to do it as minimally invasive as possible, not surgery,ㅠㅠ