<unk> , also known as<unk>  itch or functional itch disorder is pruritus not associated with a dermatologic or systemic cause. More often than not, it is attributed to a psychiatric cause.<unk>  is not the same as neuropathic itch though both are conditions which require more research. This condition is not explained well in DSM-V and is typically considered a diagnosis of exclusion. This condition is not well-studied and it is difficult to ascertain as it is seen by both dermatologists and psychiatrists. In order to provide some consensus to this condition, The French Psychodermatology Group have created diagnostic criteria for this condition.
Psychogenic pruritus
Aquagenic pruritus
HIV-associated pruritus
Hydroxyethyl starch-induced pruritus
Grocer's itch
Swimmer's itch
Phototoxic tar dermatitis
Cholestatic pruritus