Sculptra is an FDA-approved injectable that aids in the progressive restoration of missing collagen. It adds volume to the skin while tightening and thickening it. Sculptra is a dermal filler that encourages collagen growth in the skin. It was previously used to restore lost face volume, but it is also being used to add volume and definition to the buttocks. A flat butt can be given roundness or fullness with the Sculptra butt lift.