Importance: Soft-tissue augmentation with skin fillers can be delivered with needles or microcannulas, but unwanted vascular occlusions are possible.
Objective: To determine whether filler-associated vascular occlusion events of the face occur more often with injections performed with needles than with microcannulas.
Design, Setting, And Participants: This retrospective cohort study included a random sample of board-certified dermatologists deemed eligible based on membership in relevant professional societies and attendance at relevant national professional meetings.