My daughter has a swollen red bug bite on her wrist. there is only one bite can it bed bed bugs or a common household spider bite? the bite hard

Bite: A picture would be ideal. Bed bugs usually bite multiple times. They are usually very itchy. A spider bite tends to be more painful and sometimes has a blister like lesion in the center. All the best and send along a picture.

Hard to say: Bed bugs usually feed off and on for hours and cause dozens of evident bites on the victim. Significant spider bites leave a dark hole. Single bites could be many things and is often not amenable to anyone determining their origin.