Centipedes, commonly known as "centipedes", belong to the class Myriapoda and often live in dark and damp corners, brick joints, gutters, rotten wood, bark, and weeds. Each of the two front legs has a pair of appendages, which are a pair of poisonous limbs, also known as poisonous claws. The ends of the claws are hooked, and the center is tubular and connected to the poison glands in the body. When the poisonous claws pierce the skin, they release venom, causing skin damage and systemic poisoning symptoms. After the skin is bitten, two bruises will appear at the wound, followed by swelling of the surrounding skin, burning, severe pain and itching, and inflammation of the lymph nodes and lymphatic vessels. In mild cases, the rash will subside within a few days. In severe cases, local skin redness, swelling or necrosis may occur, and systemic poisoning symptoms such as fever, nausea, vomiting, dizziness, headache, palpitations, delirium and convulsions may also occur, especially in children, which can be life-threatening.