The auricular lobe was a sensitive part of a Ferengi's ear.
In 2370, with the begrudging "help" of Yeto, Doctor Julian Bashir treated Quark for a deep contusion of his auricular lobe. This condition was potentially fatal. (DS9: "Invasive Procedures")
Since Quark just simulated great pain in order to have Bashir incapacitate Yeto, it is possible those facts were made up by Bashir.