Role of Inflammation in Psychiatric Disorders in Patients With Cutaneous Lupus

The purpose of this study is to determine the role of inflammation in the high prevalence of psychiatric disorders in skin-restricted lupus (SRL) patients. SRL is an inflammatory disease. Inflammation can lead to a decrease in the synthesis of neurotransmitters via the activation of the IDO enzyme and to induce the synthesis of neurotoxic molecules (kynurenin pathway). This leads to the development of psychiatric disorders. Investigator therefore want to compare inflammation and neurotransmitter synthesis in SRL patients according to the presence or absence of psychiatric disorders. Investigator expect a decrease in neurotransmitter synthesis and activation of the kynurenin pathway in patients with a psychiatric disorder.