1. Department of Dermatology and Competence Center for Rare Skin Diseases Saint‐Eloi Hospital, and University of Montpellier Montpellier France
2. INSERM U1058 Montpellier France
3. Department of Dermatology Saint‐Louis Hospital, AP‐HP Paris France
4. Department of Pathology Saint‐Louis Hospital, AP‐HP, Paris and University Paris Diderot, INSERM UMR_S1165 Paris France
5. Department of Paediatric Dermatology Robert‐Debré Hospital, AP‐HP Paris France
6. Department of Dermatology and Internal Medicine Perpignan CH Perpignan France
7. Department of Dermatology Caremeau Hospital and University Hospital of Montpellier‐Nîmes Nîmes France
8. Department of Dermatology and Reference Center for Rare Skin Diseases L'Archet 2 Hospital, and INSERM U 634, University of Nice Sophia‐Antipolis Nice France
9. Medical office 48 rue Gioffredo NiceFrance
10. Department of Medical Genetics Purpan Hospital University Hospital of Toulouse Toulouse France
11. Department of Pathology University Institute of Cancer of Toulouse and INSERM UMR1037, University of Toulouse Toulouse France
12. Laboratory of Solid Tumour Biology, Department of Pathology and Oncology Arnaud de Villeneuve Hospital and University of Montpellier Montpellier France