Fabbrocini G acted as a speaker of consultant for Abbive, Almirall, Leo Pharma, Novartis, Amgen, UCB, Eli Lilly, Janssen. Megna M acted as a speaker of consultant for Abbive, Leo Pharma, Novartis, Amgen, UCB, Eli Lilly, Janssen. Martora F, Ocampo-Garza SS and Villani A all declare no conflict of interests. Data available on request from the authors.