When Should I Be Concerned About a Spider Bite? Topic Guide

When Should I Be Concerned About a Spider Bite? When Should I Be Concerned About a Spider Bite?: Spider bites from two types of spiders, black widow spiders and brown recluse spiders, can be dangerous. Seek medical attention for a spider bite if there is a worsening local reaction for more than 24 hours, redness spreading away from the bite, drainage from the bite, increased pain, numbness/tingling, a halo or bull's eye discoloration around the bite, or an allergic reaction (rare).

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