[header] How to identify and treat black widow spider bites [title] Recognize a bite from a black widow spider. [step] Black widow spiders have fangs. When bitten, two small puncture wounds are usually visible. 
[substeps] As the venom from the bite spreads, the area develops a target-like appearance. The fang marks are in the center, surrounded by an area of reddened skin, then another circle of red just a little further beyond the center.