Can a bulging vein that was treated with sclerotherapy and ligation (middle of forehead) look worse (bulging more)? (photo)

I suggest seeing an expert. Keep in mind, it takes about 2-3 treatments to get the improvement.  If sclerotherapy doesn't work you can try lasers. See an expert. Best, Dr. Emer.

First of all, I would have never recommended that procedure. Now that was done, appears that the vein closed. It will remain more visible and you might feel that the "bulging vein" is hard. That is expected. It could take 2-3 months before the vein will become less visible. Might take longer to completely resolved. There is a possibility that will look just about the same as before the procedure. In that case I would advise you NOT TO DO IT AGAIN!. There are some potential risks of serious complications.