Inclusion Criteria:  Woman aged 18 years or older Primi or multiparous patient Natural childbirth, regardless of the method of extraction (spontaneous, vacuum, forceps), and damage to the perineum (simple tear, episiotomy, obstetric anal sphincter injury) Patients affiliated to a health insurance plan Agreeing to participate in the study and having signed an informed consent  Exclusion Criteria:  Immediate complications related to the childbirth and requiring management in the continuing care unit (delivery haemorrhage, eclampsia, etc.) Severe neonatal complications requiring reanimation. Patient with a cardiac pacemaker Presence of a disease and/or taking photo-sensitising treatment Patient under legal protection