Along with eggs, I've used previously unopened sour cream WAY (, way) past the date and do the same as you once it's opened. Between the pasteurization of the original milk and then innoculation with good microbes, the lower moisture content and the acidity, it's not a very hospitable environment for pathogens.
Cauterization definition, to burn with a hot iron, electric current, fire, or a caustic, especially for curative purposes; treat with a cautery. See more. Dictionary.com
Electrocauterization (or electrocautery) is a safe procedure that is routinely used in surgery to remove unwanted or harmful tissue. It can also be used to burn and seal blood vessels, which helps reduce or stop bleeding.