Inclusion Criteria:  Francophone children and adolescents with hereditary epidermolysis bullosa and of an age to express themselves verbally French-speaking holders of parental authority Regular follow-ups at the reference center for genetic diseases with cutaneous expression (MAGEC), dermatology department of Necker hospital Pain at the time of treatment, the evaluation of which is greater than 4/10 (visual analogue scale VAS) without taking weak or strong opioid analgesics, yet prescribed as premedication Holders of parental authority and patients informed and not opposing their participation in the study  Exclusion Criteria:  Children and adolescents without pain at the time of treatment or for whom paracetamol is sufficient to obtain good pain control Children and adolescents already taking analgesic treatments even if their pain is not well balanced at the time of care