<unk>  is an acne-like eruption of blackheads, cysts, and pustules associated with exposure to certain halogenated aromatic compounds, such as chlorinated dioxins and dibenzofurans. The lesions are most frequently found on the cheeks, behind the ears, in the armpits and groin region. The condition was first described in German industrial workers in 1897 by Siegfried Bettmann, and was initially believed to be caused by exposure to chlorine (hence the name<unk> "). It was only in the mid-1950s that<unk>  was associated with aromatic hydrocarbons. The substances that may cause<unk>  are now collectively known as<unk> gens.<unk>  is particularly linked to toxic exposure to dioxins (byproducts of many chemical processes, including the manufacture of herbicides such as Agent Orange)—so much so that it is considered a clinical sign of dioxin exposure. The severity and onset of<unk>  may follow a typical asymptotic dose-response relationship curve.
Chloracne
Lacnunga
Mersa
Shiatsu
Laudanum
Scyllatoxin
Allergic salute
Ephedra 