Some spiders have fangs that leave a double mark behind, while others look more like a mosquito bite. Spider bites are typically red and swollen and may have blisters, pus, or discoloration.

The bite will look like a mosquito bite and have similar symptoms of swelling, redness, and itchiness. They may also be painful, depending on how deep into the skin the bite is.

Snakes, spiders and other animals or bugs that bite and cause an injury by injecting venom are venomous. Poisonous frogs, insects and plants cause health problems when they're touched, eaten or drank.

Here are six of the scariest spiders to look out for and steer clear of. There are many species of sac spiders, but the yellow sac spider (Cheiracanthium inclusum) is the most notorious. While not ...

However, the bites can cause pain, skin sores, and muscle cramps; if you think you were bitten, try to save the spider for identification, and contact your doctor if you have concerns.

Are they dangerous? Bites are not common because the spider is timid. There is less than 1 percent mortality of persons bitten by black widows. The toxin affects the central nervous system.