I had the same experience (a blue "pencil line" appeared on one naso labial fold, but not on the other).
Four years have now passed, and I still have the blue pencil line, although it has flattened a little. It is a scar, no doubt about it.
My doctor later suggested trying to dissolve the line with hyaluronidase (sp?), but I was too afraid that I would then get an even worse depression in the fold. I decided to "wait it out", but at the current rate I fear it will be another 5 years.
No, the doctor did not massage it. He had used the "standard" Restlane in the fold --- thicker than the "lite" Restylane.
He put "lite" into the area around my lips. That seemed to work well, and it lasted a long time.
The doctor is an established professional in my Colorado resort town. He does this procedure frequently. He charged $400, but gave me another free treatment in another location because he felt so bad.
If anyone has had success dissolving this purple line, I would appreciate seeing a post here on this site. Thanks. It's now Dec 2009.
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Posted to Naso Labial Restylane Filler Seems to Have Gone Wrong on 17 Dec 2009