Evaluation of the Efficacy of ROPIVACAINE in Children and Young Adults With Hereditary Epidermolysis Bullosa

Inclusion Criteria: * Minor patient or adult ≤ 21 years of age with hereditary epidermolysis bullosa, * Presenting pain at the entrance of the bath with an average of EVA or FLACC greater than 4/10 the week before the inclusion * Usually requiring premedication with weak or strong opioid * Parental consent if minor or patient consent * Affiliated with Social Security Exclusion Criteria: * Patient with a known allergy to ROPIVACAINE or other local anesthetics with amide binding or one of the excipients mentioned in the SPC * Severe renal insufficiency defined by DFG below 29ml / min * Moderate to severe hepatic insufficiency defined by a Child-Pugh B or C score and AST or ALAT greater than 3 times normal * Moderate to severe cardiac failure defined by FEGV less than 45% and/or NYHA class II to IV * Hypovolemia