R??sum?? : Les liens entre les maladies dermatologiques et les troubles de sant?? mentale, dont la d??pression, sont reconnus depuis longtemps. Cependant, peu d?????tudes de population ont examin?? cette probl??matique et aucune n???a ??t?? faite aupr??s des a??n??s. Le but de ce m??moire est d???explorer l???association entre les affections dermatologiques et les troubles d??pressifs chez les personnes ??g??es vivant ?? domicile. Pour ce faire, deux ??tudes ont ??t?? r??alis??es. La premi??re visait ?? d??crire les caract??ristiques dermatologiques de la population ?? l?????tude et la deuxi??me avait pour but de tester l???hypoth??se d???une association bidirectionnelle entre les probl??mes mentionn??s. Il s???agit d???une analyse secondaire des donn??es de l???Enqu??te sur la Sant?? des A??n??s (ESA) qui a ??t?? men??e aupr??s d???un ??chantillon repr??sentatif de la population ??g??e (??? 65 ans) vivant ?? domicile au Qu??bec. Des mesures r??p??t??es ?? un an d???intervalle (T1 et T2) ont ??t?? obtenues aupr??s de 2 cohortes successives fixes. Les donn??es de l???enqu??te ESA ont ??t?? appari??es ?? celles des registres de la R??gie de l???assurance maladie du Qu??bec (RAMQ). Les troubles d??pressifs ont ??t?? d??finis en se basant sur les crit??res du DSM-IV et les affections dermatologiques ont ??t?? mesur??es ?? partir de deux sources de donn??es (enqu??te et registres administratifs de la RAMQ). Des mod??les autor??gressifs bivari??s ont ??t?? utilis??s pour tester l???hypoth??se d???association bidirectionnelle entre les affections dermatologiques et les troubles d??pressifs. Nos r??sultats ont montr?? que pr??s de 13% et 21% des r??pondants ont rapport?? des affections dermatologiques auto-rapport??es ou avaient ??t?? diagnostiqu??s selon les registres de la RAMQ. En plus, pr??s de 6% des participants rapportaient un trouble d??pressif probable au T1 et au T2. Nos r??sultats sugg??rent la pr??sence d???une association synchronique (transversale) entre les affections dermatologiques et les troubles d??pressifs. Ce projet souligne l???importance d?????valuer et d???explorer la cooccurrence de ces deux pathologies afin d???am??liorer la prise en charge des individus atteints simultan??ment par ces deux probl??mes. Nous sugg??rons l'inclusion des affections dermatologiques dans les futures ??tudes ??pid??miologiques visant ?? explorer les liens entre les troubles de sant?? mentale et de sant?? physique chez les personnes ??g??es.//Abstract : The relationship between skin conditions and mental health disorders, which includes depression, has long been recognized. However, few population - based studies have examined this issue and none were carried out in older - adults. The aim of this project was to explore the associations between skin conditions and depressive disorders affecting the elderly living at home. To do this, two studies were conducted; the first aimed to describe the dermatological features of the study population. The second was designed to test the hypothesis of a bidirectional association between the conditions mentioned above. We carried out secondary data analyses from data collected in the Study on the Health of Seniors (ESA ) survey, which consisted of a representative sample of the elderly population (??? 65 years) living at home in Quebec. Two repeated measurements one year apart (T1 and T2) were obtained from two fixed successive cohorts. Participants in both phases of the investigation and with available health service information from Quebec???s health insurance plan agency (R??gie de l'assurance maladie du Qu??bec - RAMQ) were selected for this project. Depressive disorders were defined based on DSM - IV criteria and dermatological conditions were measured from two data sources (survey and administrative records). Cross - lagged panel models were used to test the hypothesis of association between the two mentioned conditions. Our results showed that nearly 13% and 21% of respondents have self - reported and diagnosed skin conditions, respectively. In addition, about 6% of participants reported symptoms that were consistent with a probable depressive disorder on T1 and T2. Our results suggested the presence of synchronous (cross - sectional) associations between skin conditions and depressive disorders in the elderly. This research highlights the importance of assessing and exploring the co - occurrence of these two conditions to improve the management of individuals who are affected. We suggest the inclusion of dermatological conditions in future/further studies exploring the comorbidity between mental and physical health in the older adults.