Injectable collagen update.

Injectable collagen (Zyderm Collagen Implant) has proved to be an effective means of treating certain soft tissue contour defects. A highly concentrated form of the material (65 mg/ml) is now available, and several contraindications to the use of injectable collagen have been removed or changed. This article reviews these changes and provides updated information regarding the safety of this material, the treatment of adverse reactions, and injection techniques that enhance correction.