A 35-year-old man with uncontrolled hypertension presents with recurrent epistaxis. On examination, bleeding originates from the anteroinferior part of the nasal septum. Another patient, a 28-year-old with hereditary hemorrhagic telangiectasia (HHT), presents with epistaxis from multiple sites in the nasal cavity. Which feature best distinguishes bleeding from Kiesselbach's plexus versus HHT-related epistaxis?

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