The brown recluse is a small spider known for its distinctive violin-shaped marking on its back. Typically, it measures about 1/4 to 1/2 inch in body length and has long, slender legs. This spider is primarily found in the central and southern United States, often hiding in dark, undisturbed areas like closets, attics, and basements. While the brown recluse is not aggressive, its bite can be harmful. Symptoms may include pain, swelling, and in some cases, necrosis of the skin. It is important to seek medical attention if bitten, especially if severe reactions occur.