Objective : Description of a group of children, aged under 15 years and 3 months old, outpatients or inpatients presenting a dermatologic disease, at the Grenoble Teaching Hospital, and study of the motivations of pediatricians' requests to dermatologists and the frequency of their collaboration. Patients and methods : Prospective study carried out over 6 months from May 17th to November 17th 2011 including all the dermatologic diseases of outpatients and inpatients seen in pediatric and dermatologic departments. Results : 1012 consultations were registered in different activity centers. The Pediatric Emergency Department (PED) represents 55% of all the inclusions and 8% of its global activity. Dermatologic department is about 28% and dermatologic disease in maternity 15% of inclusions. The 3 most frequent diagnostics in PED are hives, insect bites and nonspecific viral eruption. Hospitalisation was necessary in 12.4% cases. There was no death based on any dermatologic pathology. A dermatologic consultation was requested in PED for 10% of patients to help with diagnostic and treatment. In the dermatology department, the most frequent diagnostics have been nevus, atopic dermatitis and hemangioma. In this sector, 26% of the consultations were asked by PED. Conclusion : Dermatologic diseases, of very different etiology and variable severity, represent a major motivation for consultation, thus leading pediatricians to frequently turn to dermatologic advice. Hospitalisation is often needed. This study underlines the necessity to proceed to a good training and create a close collaboration between pediatricians and dermatologists, which is key to obtain the best care for children.