[Infantile perineal protrusion is a harmless condition with multiple differential diagnoses].

Among girls the frequency of infantile perineal protrusion (IPP) is 13%. The skin-coloured protrusion is thought to represent a congenital weakness in the perineum and usually resolves spontaneously. We report a case of a 13 year-old girl who for nine years had been examined and treated for haemorrhoids and other relevant differential diagnoses before being diagnosed with IPP. During this time she developed iatrogenic contact allergy after frequent application of ointment for haemorrhoids. Recognition of this common and harmless condition renders further examination and treatment unnecessary.