![]() Interestingly, it appears that bites that become systemic do not also develop necrotic wounds. Over days the blister forms a scab, which hardens and falls off to leave behind an ulcerated depression. If the bite turns a purplish colour within the first few hours, this usually indicates severe localised tissue death ( necrosis) may occur. This is characterised by a central red swollen blister that is separated from a peripheral bluish region by a white zone of firm swelling. With more serious bites a “ bull's eye” wound may form. In self-healing wounds, the bite site gets no worse than being swollen and red. The dermatological features of these spider bites depend on the severity of the bite. Systemic symptoms are of more diagnostic value. In untreated cases, a rash may develop after several days. The skin around the site of the bite is red and two fang marks may be visible where the skin was penetrated. What are the dermatological features of a spider bite? Widow spider bite ![]()
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