I have a bruise the size of a dime with two brown puncture wounds directly in the middle of the bruise. spider bite?!?

Skin bruised by bite: Yes, very insightful. The bruising can be caused by a bite...Even a recluse spider bite. These often lead to infection so watch for swelling, redness and pus... And if these occur please get to a health care expert.

Probably: Yup, sounds like it. Ice, ibuprofen, hospital if it starts making an ulcer.

Monitor: Watch and observe closely. If this should progress and become worse, you should seek medical treatment.