A healthy 43-year-old woman in Germany used a small push-button device to collect her own blood sample from her upper arm. She rated the pain at 2 out of 10, the same score she gave a standard blood draw from a vein, and put on a bandage as instructed. When she took the bandage off later that day, she found "a gaping, horizontal wound approximately 3–4 mm in length."
A surgeon closed it with a stitch, and a small permanent scar remained. Researchers at University Medical Center Göttingen and Hannover Medical School reported the case in The Journal of Vascular Access. The report was first published online in February and appears in the journal's July 2026 issue. "To our knowledge, scarring has not been previously reported as an adverse event associated with this device," the authors wrote.
