Idiopathic scrotal oedema Idiopathic scrotal oedema Typically , a 5- to 7-year-old boy presents with a swollen hemi-scrotum with erythema extending towards the anus and the groin. The testicle is scrotal and not tender, though the dartos and skin are swollen. Antihistamines may help. Idiopathic scrotal oedema Typically , a 5- to 7-year-old boy presents with a swollen hemi-scrotum with erythema extending towards the anus and the groin. The testicle is scrotal and not tender, though the dartos and skin are swollen. Antihistamines may help. Idiopathic scrotal oedema Typically , a 5- to 7-year-old boy presents with a swollen hemi-scrotum with erythema extending towards the anus and the groin. The testicle is scrotal and not tender, though the dartos and skin are swollen. Antihistamines may help.