Lichenoid cutaneous skin eruption and associated systemic inflammatory response following Pfizer‐BioNTech mRNA COVID‐19 vaccine administration

The global effects of coronavirus disease 2019 (COVID‐19) have driven unprecedented rapid development and mass deployment of vaccinations against the novel coronavirus. However, the short‐ and long‐term adverse reactions following COVID‐19 vaccinations are still under investigation as insufficient time has passed to fully explore these. The Pfizer‐BioNTech COVID‐19 mRNA vaccine has thus far shown a favourable safety profile in phase I–III studies. Although infrequent cases of generalized cutaneous reactions and systemic inflammatory response have been reported following other mRNA vaccines, these have not been reported following the Pfizer‐BioNTech vaccine. We report a case of generalized lichenoid skin eruptions and systemic inflammatory response occurring together following the first dose of the Pfizer‐BioNTech vaccine. Our case report adds to an accumulating body of literature connecting autoimmunity with the pathophysiology of the novel coronavirus disease.