There are a large number of stinging cells on the tentacles of jellyfish, which contain venom, which is mainly composed of protein, peptides and a variety of toxic enzymes, in addition to strong anesthetics, painkillers, histamine and so on. When the human body touches the tentacles of jellyfish, stinging cells can pierce the skin, causing stinging dermatitis and even death in severe cases. After a swimmer's bare limbs are stung by jellyfish, he feels tingling, burning or itching, and then a series of erythema and papules appear, and blisters, blisters, petechiae and ecchymosis may also appear. The rash can subside in 1-2 days, and most patients scab in 1-2 weeks. If the whole body is stung in many places or stung by large jellyfish with strong toxicity, chills, fever, abdominal pain, burnout and cold sweat often occur within 1-4 hours, and a few people have chest tightness, foaming at the mouth, decreased blood pressure, dyspnea and pulmonary edema, which can lead to death in severe cases. Once stung by jellyfish, don't wash it with fresh water, because fresh water can promote the release of venom from stinging cells. Wipe off the tentacles or venom attached to the skin with towels, clothes and mud as soon as possible, or rinse with seawater. ...