When preparing Sculptra for injection, I reconstitute the powder with more liquid than the manufacturer's guidelines and I do this at least 24 hours before injecting it, rather than the recommended 2 hours.
Once it has been injected, there's not much you can do as a patient to prevent bumps. As a rule, I do not inject Sculptra under the eyes because of its tendency to form bumps. Due to the thin eyelid skin, the bumps may be visible. If they do form, there's not too much you can do, except try to fill in around the bumps with another filler to make them less noticeable.
In my opinion, Sculptra is better used for deeper, thicker areas like the cheeks. For the under eye area, I prefer a hyaluronic based filler such as Restylane.


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