How do i know if i have got bitten by a spider?

Depends: It is hard to tell. Redness, swelling and warmth at the site can be due to any insect bite, and these symptoms can last for on average 48-72 h. If there are any signs of an infection developing like oozing, pain at the sites, red streaking leading away from the sites, fevers associated with the above symptoms, nausea, vomiting, a black area developing in the center, get seen! also, see picture.