Analgesic Effectiveness of Capsaicin 8% Cutaneous Patch in Children

This study concerns children aged to 12 to 17-years with local chronic neuropathic pain after trauma or surgery. It is a multicentric randomized controlled superiority trial in parallel arms : * experimental arm: Capsaicin 8% cutaneous patch * controlled arm : Hydrocolloid dressing Treatment with capsaicin application is realized at baseline, and repeated 3 months after the first patch application if needed. Tolerance is assessed during each application and by phone call in following days until stop of cold need. Efficacy is assessed monthly by clinical consultation until the end of the study (month 4).