Found this:
Bad Bug Bites Pictures Slideshow: Identify Bugs and Their Bites on MedicineNet.com
Shows bugs and bites... the Brown Recluse bite has a purple center (mine is red) and a blister develops (no blister on me). I will be watching it closely. Black Widow bites do cause an increase in Blood Pressure among other things and I've been having dizziness upon standing (unusual for me) along with the initial headache (now gone), nausea, aching joints on the affected arm, but no burning pain. I may end up going to the doc or ER if the symptoms don't go away soon!
(The above link also has a list of pet related videos... I'll have to check them out!)