Can hyaluronic acid (filler) be injected into hip dips to round out hips? Is it different from Sculptra?

I would suggest you get a more long lasting filler that stimulates collagen production such as Sculptra or Bellafill or even Radiesse

The hips are not an ideal area for filler. It would take a significant amount in order to make a difference. A better option is fat transfer. You may also be a candidate for Sculptra. See a board certified plastic surgeon near you for a consultaiton.

Hyaluronic acid fillers are excellent fillers to use in some areas. However, hip dips will be better served by injections of other materials, such as Autologous Fat Transfer, Sculptra or Radiesse . Experienced cosmetic surgeon will be able to evaluate your needs and suggest the best approach.