Getting a bug bite can be a creepy experience, especially if you don't know what tiny creature left you with that red, throbbing welt on your skin. Don't panic. Most bug bites .Black Widow Spider Bites. Black widow spider bites may cause stabbing pain in the bite area, but they can also be painless. Look for one or two red fang marks, redness, tenderness, and a nodule at the bite site. Severe muscle cramps, nausea, vomiting, seizure, and a rise in blood pressure may follow soon after. Get medical care .Bug Bites. Use our bug bite identification chart to find out what kind of bite or sting you may have. Common insect bites stings with pictures..