Contact with tentacles causes painful, urticarial lesions that may become hemorrhagic and ulcerate.
Symptoms can last up to 72 hours with skin hyperpigmentation that can last for several weeks.
Fire coral envenomation
Toxins
Crown-of-Thorns starfish envenomation
Ciguatera
Stonefish envenomation
Scombroid
Box jellyfish envenomation
Tetrodotoxin 