1. Pediatric Dermatology Department Grenoble Alpes University Hospital Grenoble France
2. Dermatology Department Grenoble Alpes University Hospital Grenoble France
3. Dermatology Department Lille University Hospital Lille France
4. Department of Pharmacology and Toxicology Paris‐Saclay University (Versailles Saint‐Quentin‐en‐Yvelines University), Inserm U‐1173, Raymond Poincaré Hospital Garches France
5. French Reference Center for Langerhans Cell Histiocytosis Trousseau Hospital Paris France
6. Pathology Department & EA4340‐BECCOH Ambroise Paré Hospital, AP‐HP & Versailles SQY University Boulogne France
7. TIMC‐IMAG Laboratory Grenoble Alpes University, Grenoble Alpes University Hospital Grenoble France
8. Pediatric Dermatology Unit Hôpital Pellegrin‐Enfants Bordeaux France