A skin biopsy reveals a 'Grenz zone' (a strip of normal dermis) separating the epidermis from a dense dermal infiltrate of neutrophils. This is suggestive of:
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Correct answer: Acute Sweet's syndrome
Sweet syndrome (febrile neutrophilic dermatosis) features a massive edema of the papillary dermis and a dense infiltrate of neutrophils. The 'Grenz zone' is a common finding in several dermal inflammatory conditions but is characteristic of the neutrophilic dermatoses.
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