Thank you for your question. Sclerotherapy agents such as Asclera may cause some discomfort, but are generally tolerable procedures. Make certain you do not feel continued pain, burning, or ulceration as these may be side effects. I would recommend perhaps pre-treating with ice to help numb the area. Be sure you are under the supervision of an experienced injector. I hope this helps.
As a sclerotherapy expert who has performed over30,000 sclerotherapy treatments over the past 30 years, I can say this is not atypical reaction. In fact, I have never had this problem in any of my patients.At most there may be some minor discomfort during the sclerotherapy procedure.There are a few reasons why sclerotherapy could be painful, but without furtherinformation it is not possible nor appropriate to say anything further. Irecommend seeking treatment for your veins from a vein expert who has a long,successful track record of performing advanced vein procedures.