Staphylococcal Scalded Skin Syndrome
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Direct answer
Staphylococcal scalded skin syndrome is a superficial blistering disease caused by exfoliative toxins from Staphylococcus aureus, mainly in children under five. The toxins split the epidermis within the granular layer, so the skin peels in sheets with a positive Nikolsky sign while the mucosa is spared. It is treated with systemic anti-staphylococcal antibiotics and supportive care, and it differs from toxic epidermal necrolysis, which involves the mucosa.
What you must remember
- Causative agent: Staphylococcus aureus strains producing exfoliative toxins A and B, which are serine proteases.
- Mechanism: the toxins cleave desmoglein 1 in the stratum granulosum, producing a superficial split within the epidermis.
- Nikolsky sign: gentle lateral pressure causes the epidermis to slide off, a finding shared with toxic epidermal necrolysis.
- Mucosal involvement: spared in scalded skin syndrome, whereas it is prominent in toxic epidermal necrolysis.
- Typical patient: children under five, and adults with reduced renal clearance of the toxin.
- Source: a localised staphylococcal focus such as conjunctivitis, impetigo, omphalitis or pharyngitis, which is often small or healed by the time the rash appears.
- Treatment: systemic flucloxacillin or cloxacillin, or a local equivalent, with fluids, analgesia, careful skin care and monitoring of fluid and renal status.
Scalded skin syndrome versus toxic epidermal necrolysis
A 3-year-old presents with widespread tender skin peeling after a week of impetigo-like sores, and the question is which condition this is. The table lists the features that separate the two entities.
| Feature | Scalded skin syndrome | Toxic epidermal necrolysis |
|---|---|---|
| Main cause | Staphylococcal exfoliative toxin | Usually a drug reaction |
| Typical age | Mainly under five | Mainly adults |
| Mucosa | Spared or minimal | Prominent and severe |
| Level of split | Granular layer, superficial | Subepidermal, with full-thickness necrosis |
| Nikolsky sign | Positive | Positive |
| Outcome | Generally good with treatment | Substantial mortality |
Both show a positive Nikolsky sign, so the mucosa, the cause and the depth of the split decide the diagnosis. The management also differs, since toxic epidermal necrolysis needs prompt withdrawal of the culprit drug and intensive supportive care.
Skin care in scalded skin syndrome resembles burns care, with protection of raw areas, gentle dressings and careful fluid balance. Mucosal sites must still be examined and documented, because the absence of mucosal erosions is itself a key diagnostic feature.
Where the exam tries to catch you
Three traps appear repeatedly on this topic.
- Trap: labelling every blistering rash in a child as scalded skin syndrome Correct: bullous impetigo and other conditions also blister, and the diagnosis rests on the superficial split and staphylococcal cause.
- Trap: using mucosal involvement to support scalded skin syndrome Correct: mucosal involvement points to toxic epidermal necrolysis, because scalded skin syndrome spares the mucous membranes.
- Trap: relying on blister fluid cultures to confirm the diagnosis Correct: the toxin acts at a distant focus, so blister cultures are often negative, and the clinical picture guides treatment.
Frequently asked questions
Which toxin causes staphylococcal scalded skin syndrome?
Staphylococcal scalded skin syndrome is caused by exfoliative toxins A and B from Staphylococcus aureus, which are serine proteases. They cleave desmoglein 1 and produce the superficial split within the epidermis.
What is the Nikolsky sign in staphylococcal scalded skin syndrome?
The Nikolsky sign in staphylococcal scalded skin syndrome is positive when gentle lateral pressure on the skin makes the epidermis slide off. It confirms that the split lies within the epidermis and is also seen in toxic epidermal necrolysis.
How does staphylococcal scalded skin syndrome differ from toxic epidermal necrolysis?
Staphylococcal scalded skin syndrome differs from toxic epidermal necrolysis by mostly sparing the mucosa, splitting at the granular layer and having a good outcome with treatment. Toxic epidermal necrolysis, usually drug-induced, involves the mucous membranes and full-thickness epidermal necrosis.
What is the treatment of staphylococcal scalded skin syndrome?
Staphylococcal scalded skin syndrome is treated with systemic anti-staphylococcal antibiotics such as flucloxacillin or cloxacillin, with the choice adjusted to local resistance. Supportive care includes fluids, analgesia, careful skin care and monitoring of fluid and renal status.