Immune System

{"ops":[{"insert":"Diagnosis and reasoning"},{"insert":"\n","attributes":{"header":1}},{"insert":"This 48 year old patient has presented with multiple lesions on his right arm, following an accidental abrasion.\n\nNote the progression of the lesions, from simple abrasions, to pruritic papules, to blackened patches of skin suggestive of eschars.\n\nConsider also that he is a cattle farmer, with a high risk of exposure to zoonotic infections; thus, several possibilities should immediately spring to mind: ulceroglandular tularaemia, cutaneous anthrax, rickettsialpox, brown recluse spider bite and orf.\n\nUlceroglandular tularaemia is a possibility here, as it typically begins as a tender, pruritic papule, followed by ulceration and necrosis of the base, with ultimate formation of a blackened eschar.\n\nCutaneous anthrax may also present with a sim"}]}

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