Unknown diagnosis - High fever and burning rash on intertrig | Figure 1

Unknown diagnosis - High fever and burning rash on intertriginous areas

A 45-year old, previously healthy woman presented with 2 days of high fever and symmetric burning rash characterized with erythema and petechiae, first started in inguinal and genital area, but appeared on both lower arms, axillary folds, under brests, on neck and behind knees. The rash was most extreme in the inguinal area (1st picture), where densely packed papules, vesicles and pustules are present. Similar rash but less pronounced is in axilla. There is a painful burning sensation on touch. Legs show palpable purpura. The fever is up to 40°C. There are no mucosal involvement. There are no other symptoms. There are no epidemiological risk factors, except that she lives on the shore of the sea. She didn't use any medications before illness started or supplements. She didn't use any new hygiene products.

What would be the differential diagnosis and presumed treatment? @nebushwacker

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