Analgesic Effectiveness of Capsaicin 8% Cutaneous Patch in Children

Inclusion Criteria: * Children aged 12 to 17 years (lower age limit of 12 has been chosen to ensure NPSI full filling). * Male or female. * Persistent neuropathic pain more than 3 months after surgery or trauma despite treatment following recommendations. * Neuropathic pain is defined as a DN4 score equal to or greater than 3/7 or 4/10, and localized in a nerve territory explained by the surgery or the trauma. * Treatment, survey and follow up must be realized in an identified investigating center of the study * For patients of childbearing potential: use of an adequate method of contraception\* during the course of the study through 48 hours after the last patch application (girls of childbearing potential must have a negative serum or urine pregnancy test within 7 days prior to the first patch application). * Adequate contraception includes sexual abstinence, progestogen-only oral hormonal contraception, where inhibition of ovulation is not the primary mode of action, male or female condom with or without spermicide, cap, diaphragm or sponge with spermicide, combination of male condom with either cap, diaphragm or sponge with spermicide (double barrier methods) Exclusion Criteria: * Intellectual deficiency not allowing full filling of NPSI. * Insufficient command of the French language to full fill NPSI and other evaluation tools. * Parents' refusal of consent. * Minor patients' opposition. * Underlying neurological disease. * Ongoing neurotoxic treatment. * Already t…