Can Restylane Make Under Eye Circles Look Darker?

If you are still blue in 2 more weeks then it probably is not a bruise. If the Restylane was injected superficially it might look blue.if that's the case it can be dissolved by injecting hyaluronidase. See your doctor for a followup exam.

One key advantage of hyaluronic acid is easy reversibility. The use of Hyaluronidase can dissolve the product within one week. Best ways to avoid bruising or bluish color is prevention and excellent techniques. Here are some ways:

conservative, progressive, staged, and multiple treatments Rather than one single maximal treatment
injecting deep first before injecting more superficial
treating the whole cheek rather than just around the eyes
combining with Botox, laser or chemical resurfacing
combing with PRP

I agree with the previous post. The darkening you seem to describe is usually seen when Restylane is placed too superficially. When it is not placed close to the bone but under the thin skin of the lower lid the light that reflects back disclose a bluish tone (TYNDALL Effect). This would also go along with the lumpiness. This may need to be removed with an enzyme that breaks up the filler and, should you want it, be totally re-done when the inflammation subsides.