If there is just a: Visible, dark vein with no other findings - not sure why you would think it was a spider bite. Spider bites can have variable appearances. It might cause a pink or red bump with no symptoms. Or it could itch or be painful. Venomous spiders may cause significant pain radiating far from the site, cramping, sweating, necrosis of tissue or worse if there is an allergic reaction.
Answered 3/23/2014
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