1. Dermatology Department Hospital St Louis Paris 7 University 1 Avenue Claude Vellefaux 75010 Paris France
2. Pathology Department Hospital St Louis Paris 7 University 1 Avenue Claude Vellefaux 75010 Paris France
3. Dermatology Department CHU Bordeaux Bordeaux University Hospital Saint‐André 1 rue Jean Burguet 33075 Bordeaux France
4. Rhumatology Department Hospital Cochin Paris 5 University 27 rue du faubourg saint Jacques 75014 Paris France