It is usually found in structures that contain dry space which is cluttered, undisturbed and contains a supply of insects or related organisms to be used as food for the spiders. Both males and females are poisonous. The color of the brown recluse varies from light tan to a dark brown. With its legs in a normal standing position, the spider covers an area about the size of a quarter. Reaction to the bite varies considerably depending on the amount of venom injected and the victim's sensitivity.
Fatalities are rare.
The venom causes tissue at the site of the bite to die. The victim may not be aware of being bitten for an hour or more, or a painful reaction may occur almost immediately. A stinging sensation is followed by intense pain. A small white blister usually develops at the site of the bite. The affected area enlarges, swells, and the tissue is hard to the touch.