Staphylococcal scalded skin syndrome: Viva

Branch 1: Recognising the diagnosis and the cardinal clue

The candidate should recognise this infant as having generalised staphylococcal scalded skin syndrome, with the prodrome of irritability and fever, the scarlet erythema around the mouth and flexures, the flaccid bullae, and the sheet-like peeling with a positive Nikolsky sign. The diagnosis is clinical, and the picture is characteristic enough that laboratory confirmation is not required to begin treatment. [1]

The candidate should then state explicitly the feature that separates this disease from Stevens-Johnson syndrome and toxic epidermal necrolysis, which is the sparing of the mucous membranes. The oral, conjunctival, and genital surfaces are intact in SSSS, and their involvement would shift the diagnosis toward a drug-induced reaction. Documenting the mucosae at every assessment keeps this distinction clear and directs the child to the correct pathway. [3]

Branch 2: Explaining the mechanism and the source

The examiner will probe the pathophysiology. The candidate should explain that phage-group-II Staphylococcus aureus colonises a distant focus, often the conjunctiva, the umbilicus, the nasopharynx, or the nappy area, and secretes exfoliative toxins A and B. These toxins are serine proteases that travel in the blood and cleave desmoglein 1 in the superficial stratum granulosum, dissolving the adhesion between superficial keratinocytes and producing the positive Nikolsky sign. [2]

The candidate should explain why the mucosae are spared by naming desmoglein 3, which the toxin does not cleave and which compensates for desmoglein 1 in the oral, conjunctival, and genital surfaces. This molecular fact is the thread that ties the whole disease together and is the most testable single concept. The candidate should also note that blood cultures are usually negative because only the toxin circulates, and that swabbing the suspected focus is more revealing than blood cultures. [2]

Branch 3: Choosing antibiotics and supporting the skin

The candidate should describe the management as a combination of anti-staphylococcal antibiotics and supportive skin care. Intravenous flucloxacillin or cefazolin is first-line, and adding clindamycin is rational because it suppresses toxin synthesis through its effect on ribosomal protein production. Vancomycin replaces flucloxacillin if methicillin-resistant Staphylococcus aureus is suspected or prevalent locally, with infectious-disease advice to tailor the choice. [3]

The candidate should then address supportive care, explaining that the child with extensive skin loss behaves like a burn patient and needs attention to fluid, temperature, and pain. Analgesia should precede any handling of the raw skin, intravenous fluids should cover maintenance plus insensible loss, and a neutral thermal environment prevents hypothermia. Emollients and non-adherent dressings protect the healing skin, and the family should be counselled that healing occurs without scarring within one to two weeks. [3]