A bite from a black widow is often. Webjul 21, 2023 · part 1. Websep 23, 2022 · noticeable skin discoloration.

Identifying common spider bites. Spider bites can cause redness, pain and swelling, or you might not. Spider bites are usually harmless, and spiders don't usually bite unless threatened. The rash caused by a spider bite will likely take on a different color from your surrounding skin.