[Obliviate]

I just did a quick google because this sounded pretty interesting and this link seems pretty good.

The guy said that red can look pink before it's fully healed and will then darken at a later stage, so I guess that the fading is normal. But three weeks is a long time, like you say.

To be on the safe side, it might be worth calling the place and asking a few questions. They're probably the best ones to advise, seeing as they're fully qualified