Sclerotherapy on abdomen. Should I get the treatment again?

I agree with the previous comments - spider veins on the abdomen can be successfully treated and it can take 1 to 3 sessions for clearance, spaced 6 weeks apart. Longer is OK. I have treated spider veins on the shoulders, back, abdomen, and chest. Varicose veins in the abdominal area should be evaluated with an ultrasound, but scattered spider veins seem to be a normal variant. Go ahead and give it another try, recognizing that these veins, like all spider veins, can take a series of sessions to resolve completely and can re-occur. 

This is difficult to answer without an in-person evaluation.Typically it takes 2-3 treatments of sclerotherapy for improvement otherwise you can try lasers for the smaller vessels. I recommend following up with your Doctor about the best timing of treatments. Best, Dr. Emer

There is never any harm in waiting a bit longer to see the results of sclerotherapy.  It will not defeat the purpose of having the first 2 treatments.  It often takes a month or 2, sometimes even longer, to observe the final results of a sclerotherapy treatment.