1. Dermatology Unit and Skin Bank, Department of Medical, Surgical and Neurosciences Siena University Hospital Siena Italy
2. Groupe d'Imagerie Cutanée Non‐Invasive (GICNI) of the Société Française de Dermatologie (SFD) Paris France
3. Department of Medicine, Surgery and Neurosciences Pathological Anatomy Section University of Siena Siena Italy
4. Department of Dermatology, Hôpital Erasme Université Libre de Bruxelles Brussels Belgium
5. Institut Jules Bordet Université Libre de Bruxelles Brussels Belgium
6. Dermatology Unit University Hospital of St‐Etienne Saint Etienne France