b658aed6__World_Interactions___UESPWiki__Details
[Encounter Name] Bitten by a vampire [Options] If you have a Potion of Cure Disease you can heal him and receive 100 Gold; if not he will run off in a panic. Only a found or purchased potion will work; one created using Alchemy won't. A map marker for a vampire lair will be added if asked. [Requirements] None [Details] 
A hunter approaches and asks for a potion to cure himself after being bitten by a vampire.
Skyrim:World Interactions - UESPWiki
Details