Inclusion Criteria:  FOR TRANSVERSAL STUDY:  any patient, regardless of age, consulting a practitioner at the Cayenne Hospital with a clinical suspicion of leprosy Diagnosis of leprosy, confirmed histologically or bacteriologically, made in Guyana between 2006 and 2022 Skin biopsy (or dermal smear or nasal swab) available in the anatomopathology department of the Andrée Rosemon Hospital and analysable (correct state of preservation and sufficient quantity of tissue)  FOR CASE-CONTROL STUDY - CASES:  any patient, regardless of age, consulting a practitioner at the Cayenne Hospital with a clinical suspicion of leprosy Diagnosis of leprosy, confirmed histologically or bacteriologically, made in Guyana between 2006 and 2022  FOR CASE-CONTROL STUDY - CONTROL:  Any patient, of any age, consulting for a dermatological pathology not clinically suspicious of leprosy during a dermatological consultation by a practitioner of the Cayenne Hospital  Exclusion Criteria:  FOR TRANSVERSAL STUDY:  Opposition to participation Diagnosis of leprosy invalidated after inclusion  FOR CASE-CONTROL STUDY - CASES:  Opposition to participation Inability to answer to the questionnaire Diagnosis of leprosy invalidated after inclusion  FOR CASE-CONTROL STUDY - CONTROL:  Opposition to participation Inability to answer to the questionnaire