Resumen

Objectives: 1. To define anatomical and aesthetic determinants of neck–shoulder contouring. 2. To evaluate the synergistic mechanism of botulinum toxin and HA fillers. 3. To demonstrate how injectables can achieve a refined, “sleeveless-ready” silhouette. 4. To assess safety, reproducibility, and clinical feasibility of combination protocols. Introduction: Upper body aesthetics, particularly the neck–shoulder junction, are gaining clinical relevance. Conventional approaches remain limited in addressing combined muscle hypertrophy and volume deficiency. Recent advances in injectables enable a multimodal strategy: botulinum toxin for functional muscle modulation and HA fillers for structural augmentation. This study proposes a synergistic, minimally invasive paradigm for precise contour refinement. Materials / method: A retrospective analysis was conducted on patients undergoing combined toxin–filler treatment for neck–shoulder contouring. Standardized protocols included targeted trapezius toxin injection to reduce muscle bulk, followed by layered HA filler placement to enhance shoulder curvature and continuity. Emphasis was placed on anatomical precision, controlled volumization, and safety. Outcomes included photographic analysis, patient-reported satisfaction, and adverse event monitoring. Results: The combination approach yielded consistent improvements in neck elongation, shoulder slope, and contour definition. Toxin-mediated muscle reduction enhanced cervical length, while fillers restored structural harmony. High patient satisfaction was observed, particularly regarding natural appearance. Compared to monotherapy, the synergistic protocol demonstrated superior aesthetic balance. Adverse events were mild, transient, and self-limited. Conclusion: Toxin–filler synergy represents a reproducible, minimally invasive strategy for upper body contouring. By integrating functional and structural modulation, this approach enables precise, patient-tailored outcomes. It expands the clinical application of injectables beyond facial aesthetics and supports a paradigm shift toward comprehensive, non-surgical body sculpting.