I have a bite on my thigh on the outside area but i'm not sure if its a spider bite how can i tell if its a spider?

Spider bites: Spider bites are usually appreciated as 2 "dots" on the skin which are close together. Most people who see me in the ER are usually concerned about whether they are at risk for further problems from a spider bite. Those problems fall into several categories: Allergic reactions, infection, and direct toxic effects, as seen most commonly with the black widow and brown recluse spider in my area.