I had sculptra injected 6 days ago and still have a black eye, will it go away, or will it stay?

Bruising can happen after any filler, including Sculptra.  The issue with Sculptra is due to the particulate nature of the filler, a larger caliber needle is required often 25 gauge.  This can lead to bruising, particularily if injected with shorter needles near the upper cheek area.  

You are already fairly far along in the process of resolution after bruising, and should notice the yellow color diminishing very rapidly over the next few days. Applying a prescription cream called Biafine, and an over-the-counter vitamin K cream, will hasten the process. To minimize bruising, I like to employ one or more of the following:      -- have patients avoid supplements and medications that can cause bruising (there is a very long list) for from 4 days to two weeks, depending upon the supplement/medication,      -- recommend arnica gel and tabs, vitamin K cream before the treatment,      -- mix a little epinephrine into the fillers,      -- use blunt-tipped cannulas for injections wherever possible,        -- avoid injecting large amounts of fillers at a single session,      -- inject very slowly,      -- use ice packs both immediately during/after the injections as well as at home,      -- recommend Vitamin K cream, Biafine, and arnica after the treatment,      -- and laser any bruises with GentleLase, which is dramatically effective in most patients.With these measures, patients rarely have a significant issue with bruising.It will resolve. Using a yellow cream (Clinique or Physician's formula) under a setting powder and an opaque foundation will cover them fairly well.

The bruise will heal but it may take some time. The area under the eye is quite sensitive and bruises more easily than other areas and can also take longer to heal.