Buy venom of pit viper, Pit vipers like cottonmouth, copperhead and rattlesnake are greatly poisonous snakes and these snakes leaves one, two or even three puncture marks on the skin. However you always won’t see any marks. A pit viper snake bit symptoms typically come into view within some minutes to few hours after the snake bite. It may include the following symptoms- sign of shock severe and immediate pain with fast swelling swelling there in lymph node near the bite ...