For spider bites. when they bite. do they just draw blood, or are they also injecting venom? If infecting venom, what type of blood test should I get to see any damage done? I have aprx 40 bites, some small, some apx size of a dime. I have had 2 pest control people out, still getting bit. all I want to know is if a blood test will show any thing, if they are injecting venom.