[Livedo reticularis following administration of COVID-19 vaccine: a case report].

The emergence of severe acute respiratory syndrome coronavirus 2 has made it crucial to develop safe vaccines. Three main types of vaccines are currently available. Although they have proven to be very secure, they have caused various adverse effects. We here report a rare case of livedo reticularis following the administration of COVID-19 vaccine in a 54-year-old woman. It occurred 24 hours after vaccination, accompanied by respiratory, digestive, and neurological disorders and deterioration in general condition. Examinations revealed skin lesions compatible with livedo reticularis, mild inflammatory syndrome and hypercholesterolemia. Imaging showed no abnormalities. Immunological tests were positive for lupus anticoagulant. The patient received symptomatic treatment, with improvement in neurological and joint symptoms and a slight regression of skin rashes. After three months, the lupus anticoagulant test remained positive, confirming post-vaccination antiphospholipid syndrome (APS). The association of livedo reticularis with COVID-19 vaccine should not be underestimated and its degree of severity remains to be determined. More data and cases need to be collected for a more in-depth and detailed analysis.