Subjectively, on the implantation process: I did one with local anaesthetic and one without. Unexpectedly, I preferred without because the process of injecting the anaesthetic was more uncomfortable and caused a little puffiness that made implantation more difficult.
Scarring is highly dependent on your skin. Neither of my entry points were visible after a couple of months.
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This is why the nurse who did mine said I was only allowed to use topical. 