Are compression stockings necessary after a sclerotherapy? The veins reappeared a week after the procedure. (Photo)

I had a sclerotherapy done 6 weeks ago. Right after the procedure the veins were gone. But about a week later they appeared again. Is this normal? do they disappear and then Reappear as they fade? Or was this due to me NOT wearing my compression stockings. I only wore them a clouple of times about a week after I had the sclerotherapy.