is it normal to feel hard after sclerotherapy?

Yes you should see your physician you may have clots that have formed or an infection.  At minimum it may be a little inflammation but it is best to be checked out. Best, Dr. Emer.

Scleorosant solutions cause an inflammatory reaction in the veins that have been injected. PROPER compression over the veins that have been sclerosed prevents the pooling of blood and blood clotting. Since the sclerosed veins are superficial, they may be felt as lumps. If there is tenderness or discoloration, the old blood ("coagulum") should be drained to prevent ongoing inflammation.Contact your treating doctor for an evaluation and also a scan to exclude (rule out) concomitant deep vein clots.BestDr Karamanoukian

Hello. The mechanism by which sclerotherapy works is by causing irritation of the lining of the venous walls. This triggers an inflammatory reaction, and eventually, the affected veins"dissolve". Pain can be due to this  inflammation or one could develop a superficial or deep phlebitis or even a blood clot. Absolutely, see your physician who performed the procedure as he/she would want to know of any possible concerns and would be able to evaluate your leg and treat it appropriately.

Sclerotherapy can lead to hard areas post treatment and this is usually do to trapped blood in the treated veins.  Sometimes evacuating these areas under local anesthesia gives immediate relief.  You should follow up with your treating physician. Also applying warm compresses and ibuprofen may help.

Thanks for your question.  First of all, I recommend you go back and see the physician who injected you; it is likely they would want to see you back so they could help you manage any issues that arise.  In my experience, it is possible you have developed a small superficial blood clot in the veins that were treated. This is not dangerous, and not the same as blood clots that can travel to the lungs.  These blood clots stay put unless you poke them with a large needle and manually drain some of the blood out.  This is something I do routinely for my sclerotherapy patients two weeks post-op.  Without photos I can't say for sure, though, that this is what is happening to you.  I hope this helps, and best of luck to you in the future!