In one line
Most paediatric gynaecological complaints are benign consequences of a hypo-oestrogenic, anatomically exposed prepubertal tract — vulvovaginitis, labial adhesions, physiological discharge — and are managed conservatively; the consultant's task is to recognise the small set of presentations that are not benign (a vaginal foreign body, a rhabdomyosarcoma, precocious puberty, and above all sexual abuse), and to know that in South Africa a reasonable suspicion of child sexual abuse triggers a statutory duty to report, a forensic pathway, and time-critical HIV post-exposure prophylaxis.
Mechanism & pathophysiology
The whole of prepubertal gynaecology follows from one fact: the genital tract of a girl between the neonatal oestrogen withdrawal and the start of puberty is unoestrogenised. Maternal oestrogen plumps the neonate's vulva and produces a physiological white discharge and even a brief withdrawal bleed in the first fortnight of life; once that clears, the child enters years of low oestrogen until adrenarche and gonadarche. That hormonal vacuum sculpts an environment that is the mirror image of the adult vagina.
The prepubertal vulvovaginal mucosa is thin, atrophic and red, not because it is inflamed but because the epithelium is only a few cell layers deep and the underlying vessels show through. There is no glycogen-rich superficial epithelium, so there are no lactobacilli and no lactic acid; the vaginal pH is neutral to alkaline (around 6.5–7.5) rather than the protective acid of the oestrogenised tract. The labia minora are flat and the labia majora carry no fat pad and no pubic hair, so the introitus is unprotected and the vagina, urethra and anus sit close together. The result is a short, exposed, alkaline, antibacterially undefended canal a few centimetres from the perineum and the anus — anatomy that explains almost every common complaint. Faecal and skin flora colonise easily, irritants reach the mucosa directly, small objects can be introduced and retained, and the thin skin splits and adheres readily.
Oestrogen reverses all of this at puberty. The epithelium thickens and cornifies, glycogen returns, lactobacilli recolonise and acidify the vagina, the labia develop and protect the introitus, and physiological leucorrhoea appears as a normal sign of impending menarche. The adolescent tract behaves like the adult tract — which is why the adolescent's gynaecological problems (dysmenorrhoea, heavy or irregular bleeding, the early features of polyendocrine/metabolic ovarian syndrome, PMOS) are diseases of a functioning, cycling, oestrogenised system, while the prepubertal child's problems are diseases of an exposed, atrophic, hypo-oestrogenic one. Holding those two developmental contexts apart is the single organising idea of the topic: the same symptom — bleeding, discharge, an adherent vulva — means something different on either side of puberty.
Assessment
The history is taken largely from the carer but, in an older child, partly from the child, and it is shaped by the developmental context above.
- Discharge — colour, smell, blood-staining, duration, and crucially whether it is recurrent or persistent and offensive (the foreign-body pattern). Ask about hygiene practice, bubble baths and soaps, threadworm symptoms (perianal itch worse at night), and recent respiratory or skin infection (a clue to a specific respiratory or skin pathogen seeding the vulva).
- Bleeding — distinguish true vaginal bleeding from haematuria or rectal bleeding, which carers frequently confuse. Ask about trauma, signs of puberty (breast budding, growth spurt, pubic hair), and any exposure to exogenous oestrogen (the contraceptive pill, oestrogen creams, phyto-oestrogen-containing products).
- Itch and skin change — figure-of-eight white atrophic perianal and vulvar change suggests lichen sclerosus; soreness with normal-looking skin suggests non-specific vulvovaginitis.
- The safeguarding history runs in parallel, not as an afterthought. Behavioural change, sexualised behaviour inappropriate for age, a disclosure, an inconsistent or changing account of an injury, a recurrent or unexplained genital symptom, or a confirmed sexually transmitted infection all raise the question of abuse, and the history must be documented verbatim where a disclosure is made.
Examination of a child is a skill, not a reflex. It is done with explicit consent from the child appropriate to age and from the carer, with a chaperone, in a warm room, usually in the frog-leg or knee-chest position with gentle labial traction or separation — the knee-chest position often opens the lower vagina enough to see a foreign body without instrumentation. The hymen and lower vagina are inspected; the prepubertal hymen is oestrogen-poor, thin and exquisitely sensitive, so a speculum is never used in the clinic on a prepubertal child. A genital examination is never forced: a struggling, distressed child should not be restrained for a non-emergency examination. Where the vagina must be seen properly — a suspected foreign body that cannot be flushed out, persistent bleeding, a suspected tumour, or a forensic examination in a young or traumatised child — the answer is examination under anaesthesia (EUA) with vaginoscopy, which allows full inspection, lavage, biopsy and foreign-body removal in one controlled episode. A failed or traumatic clinic examination teaches the child that the genital examination is something done to her against her will — exactly the lesson a recently abused child must not be taught.
Investigations are targeted, not routine. A vulval/vaginal swab is taken only when discharge is purulent, bloody or persistent — most non-specific vulvovaginitis needs no swab and no antibiotic. Perianal tape for threadworm ova; urine dipstick and culture where urinary symptoms confound the picture. Pelvic ultrasound assesses uterine size and endometrial thickness (a marker of oestrogen exposure in suspected precocious puberty), adnexal masses and, sometimes, a radio-opaque foreign body. Where puberty is precocious, the work-up extends to bone age, basal and stimulated gonadotrophins and oestradiol. In any child where abuse is suspected, the microbiological work-up is also forensic, and the recovery of a sexually transmitted organism in a prepubertal child is a finding of major medico-legal weight, handled through the formal pathway rather than as an ordinary swab result.
Management
Organise the response immediate → ongoing → long-term, and let the developmental mechanism dictate the plan.
The common, benign conditions
Childhood vulvovaginitis is the commonest paediatric gynaecological complaint, and the great majority is non-specific — an irritant/hygiene-related inflammation of the exposed, atrophic vulva rather than an infection needing an antibiotic. Management is hygiene and skin care: loose cotton underwear, avoidance of bubble baths, soaps and biological detergents, wiping front to back, salt or emollient sitz baths, barrier emollient, and treatment of threadworm if present. Most settles with these measures alone. A specific vulvovaginitis — a single organism causing a purulent, sometimes bloody discharge — is treated for the organism: group A Streptococcus and Haemophilus influenzae (often after a sore throat or coryza) with an appropriate oral antibiotic, Shigella (a classically bloody discharge) and the rest as cultured. A persistent, foul, blood-stained discharge unresponsive to hygiene measures is a retained vaginal foreign body until proven otherwise — most often wadded toilet paper — and warrants vaginal lavage or, if not retrievable in clinic, vaginoscopy under anaesthesia. Recovery of a sexually transmitted organism is a different category of finding and is managed as possible abuse.
Labial adhesions are acquired fusion of the labia minora across the midline, a consequence of the low-oestrogen, easily-inflamed vulva, peaking in infancy and early childhood. The default is observation: most are asymptomatic, do not obstruct the urinary stream, and resolve spontaneously as endogenous oestrogen rises at puberty. Treatment is reserved for the symptomatic child — recurrent urinary infection, post-void dribbling from a urine pocket, or near-complete fusion — and is topical oestrogen cream applied along the adhesion line for a few weeks (occasionally topical corticosteroid), with continued bland emollient afterwards to prevent recurrence. Oestrogen is not without effect: transient breast budding, vulval pigmentation and local irritation occur and reverse on stopping. Manual or surgical separation is a last resort for dense, symptomatic adhesions that fail medical treatment, because forcible separation re-traumatises the raw surfaces and adhesions recur. The evidence supports this restraint: a comparative series found near-universal resolution with topical oestrogen but also high resolution with observation alone, and side-effects and recurrences occurred only in the treated group — so the threshold to apply oestrogen is symptoms, not the appearance.