Abrupt onset of Sweet syndrome, pityriasis rubra pilaris, pityriasis lichenoides et varioliformis acuta and erythema multiforme: unravelling a possible common trigger, the COVID‐19 vaccine. (1st February 2022) - Sechi, A.; Pierobon, E.; Pezzolo, E.; Germi, L.; Trevisan, G.; Zardo, D.; Riva, G.; Mondino, S.; Naldi, L.