Causes
The cause of delusional disorder is unknown, but genetic, biochemical, and environmental factors may play a significant role in its development. Some people with delusional disorders may have an imbalance in neurotransmitters, the chemicals that send and receive messages to the brain. There does seem to be some familial component, and immigration (generally for persecutory reasons), drug abuse, excessive stress, being married, being employed, low socioeconomic status, celibacy among men, and widowhood among women may also be risk factors. Delusional disorder is currently thought to be on the same spectrum or dimension as schizophrenia, but people with delusional disorder, in general, may have less symptomatology and functional disability. Diagnosis
Differential diagnosis includes ruling out other causes such as drug-induced conditions, dementia, infections, metabolic disorders, and endocrine disorders. Other psychiatric disorders must then be ruled out. In delusional disorder, mood symptoms tend to be brief or absent, and unlike schizophrenia, delusions are non-bizarre and hallucinations are minimal or absent.Interviews are important tools to obtain information about the patients life situation and history to help make a diagnosis. Clinicians generally review earlier medical records to gather a full history. Clinicians also try to interview the patients immediate family, as this can be helpful in determining the presence of delusions. The mental status examination is used to assess the patients current mental condition. A psychological questionnaire used in the diagnosis of the delusional disorder is the Peters Delusion Inventory (PDI) which focuses on identifying and understanding delusional thinking.
Dermatitis repens (also known as Acrodermatitis continua,: 1026  Acrodermatitis perstans, Pustular acrodermatitis, Acrodermatitis continua of Hallopeau, Acrodermatitis continua suppurativa Hallopeau, Hallopeaus acrodermatitis,  Hallopeaus acrodermatitis continua, and Dermatitis repens Crocker) is a rare, sterile, pustular eruption of the fingers and toes that slowly extends proximally. : 1026 : 631 : 195

See also
List of cutaneous conditions
François Henri Hallopeau
Psoriasis
Skin lesion


== References ==