They are found near the surface during times of diminished light. These organs function long after the animal is dead. Venoms include various substances, some of which trigger allergic reactions . The most toxic animals are found along the Indo-Pacific and Australian waters. May progress to cause nausea, vomiting, diarrhea, lymph node swelling, abdominal and back pain, fever, chills, and sweating.
Severe reactions can cause difficulty breathing, coma, and death.
Persistent redness and irritation after 2-3 days may signal bacterial infection of the wound. Avoid fresh water because it will increase pain. Do not rub or apply ice. Remove tentacles with tweezers. Apply shaving cream or a paste of baking soda or mud.