how adjectives is PREAURICULAR SINUS? how worse can it receive except treated?

* In the US: In one study, the incidence in the United States is estimated to be 0-0.9%, and the incidence within New York State is estimated to be 0.23%.
* Internationally: In Taiwan, the incidence is estimated to be 1.6-2.5%; in Scotland, 0.06%; and within Hungary, 0.47%. In some parts of Asia and Africa, the incidence is estimated to be 4-10%.
Never heard of that one.