A spider bite with a bruise, dangerous?

It isn't that . Uncommon to have bruising around a spider bit. In ; of it's self it is not of great concern. Seek medical care asap if you think a spider bit you ; you have severe pain (can be felt at bite site ; possibly chest, back or abdomen); abdominal cramping /rigidness or ulceration of skin at site. You may need a tetanus shot (if you don't know when your last shot was or it has been > 10 years).