To treat a delayed jellyfish sting reaction (itchy rash days/weeks later), use oral antihistamines (like Benadryl) and topical steroid creams (hydrocortisone or stronger prescription ones like clobetasol) for itching and inflammation, with severe cases needing potent topical/intralesional steroids, potentially for weeks. See a doctor for severe, spreading, or infected symptoms, or if the sting was near the eyes/mouth, as stronger treatments or specific antivenom (for dangerous species) might be needed.
A delayed rash or other skin reaction may be treated with oral antihistamines or corticosteroids. You may also be given oral pain medicine. Eye flushing. A jellyfish sting on or near the eye generally requires immediate medical care to control pain and flush the eye.
When an itchy rash occurs several days to weeks after a sting, the rash may mean a delayed skin reaction has occurred. A delayed reaction can occur many times over the course of 1 to 2 months following a sting. You may have a fever, weakness, or joint stiffness or swelling.
Severe jellyfish stings can affect multiple body systems. These reactions may appear rapidly or several hours after the stings. Symptoms of severe jellyfish stings include: Stomach pain, nausea and vomiting.
Most jellyfish stings are harmless. But some jellyfish stings can cause serious harm. If you, or someone you're with, are stung, get help right away. If you're experiencing life-threatening symptoms such as difficulty breathing, call 911 or go to your nearest emergency room.
When an itchy rash occurs several days to weeks after a sting, the rash may mean a delayed skin reaction has occurred. A delayed reaction can occur many times over the course of 1 to 2 months following a sting. You may have a fever, weakness, or joint stiffness or swelling.
Vinegar is a weak acid that might keep the stingers from firing for some kinds of stings (especially from dangerous types like box jellyfish). Do not rinse with fresh water (like tap or bottled water) because that can make more stingers fire. Rinsing a sting with seawater may prevent stingers from releasing more venom.
Severe pain combined with breathing difficulties could be a sign of a severe allergic reaction or a sting from a particularly potent jellyfish species. Don't hesitate—seek medical care immediately for a thorough evaluation and prompt treatment.
Allergic reactions after insect stings may have a delayed onset, differing from the usual immediate anaphylactic pattern. Ten patients, aged 6 to 78 years, had allergic reactions 1 to 2 weeks after an insect sting.
Furthermore, some types of Chrysaora jellyfish (such as the box jellyfish, found mostly in Australia), are so dangerous that their stings can be fatal. The stings of this type of jellyfish typically cause burn-like wounds and chronic scarring which can lead to permanent scarring.
Delayed hypersensitivity or serum-sickness–like reactions several days after the infusion can also occur. Symptoms include severe pruritus; headaches; hand, facial, or lip swelling; myalgias; rash; sore throat; or dysphagia.
Irukandji syndrome is a painful, potentially lethal condition caused by the sting and envenomation from multiple jellyfish species. It is characterized by severe pain, muscle cramping, hypertension, and potentially life-threatening cardiac complications.
Sometimes jellyfish stings can become infected. Please see a doctor immediately if you have any of the signs of an infection, such as the wound becoming more painful, more redness, or you develop a fever.
Delayed-type hypersensitivity reaction to Cnidaria (jellyfish) constitutes a distinct clinical condition in which eczematous lesions manifest weeks or months subsequent to exposure to the invertebrate.
Types of Jellyfish Sting Reactions
Symptoms are raised, red lines that cross each other. The sting causes pain or burning at the site. Sometimes hives in the sting area occur. Blisters can occur in severe cases.
Most jellyfish stings improve within hours, but some stings can lead to skin irritation or rashes that last for weeks. Contact your provider if you continue to have itching at the sting site. Topical anti-inflammatory creams may be helpful. Portuguese man-of-war and sea nettle stings are rarely deadly.
In rare cases, anaphylaxis may be delayed for hours. Signs and symptoms include: Skin reactions, including hives and itching and flushed or pale skin. Low blood pressure (hypotension)
Delayed or late-phase allergic reactions generally occur 2 – 6 hours after exposure (and even longer in some people). Signs and symptoms of delayed or late-phase allergic reactions are generally the same as those for immediate allergic reactions.
If you experience symptoms like severe chest pain, nausea, sweating, shortness of breath, severe swelling, or slurred speech, you should immediately seek medical care. If you have a diagnosed allergy to stinging insects and you get stung, use epinephrine right away.
Treat itching with an over-the-counter anti-itch cream and/or an antihistamine, such as diphenhydramine (Benadryl®). If itching is severe, see a doctor for a stronger preparation. See a doctor if someone is stung in the mouth, in or near the eye, on a large area of skin, or on the genital region.
Severe pain lasts 1-2 hours. Itch may last for a week. If the skin damage is severe, red or purple lines can last for weeks. General Reactions can occur if there are many stings.
Once activated, several needle-like projections, called nematocysts, shoot out from the tentacles in a lightning-fast reaction time of 11 milliseconds. Venom is delivered shortly later. "Think of [the nematocyst] like a garden hose under no pressure," Seymour explains in the video. "...
Seek medical help right away. Get medical attention right away if pain increases or there are any signs of breathing difficulty or chest pains. As soon as possible, rinse the sting site with large amounts of household vinegar for at least 30 seconds. Vinegar is safe and effective for all types of jellyfish stings.
As well as dousing jellyfish stings with vinegar or hot water, the new EMS policy says lifeguards should scrape venom sacs from the skin. Clark said if lifeguards aren't in sight, beachgoers could remove the sacs in a pinch, as long as they're careful.
Seabather's eruption is a rash that develops from the stings of jellyfish or sea anemone larvae. Although these rashes are annoying, they are not a serious medical problem. When an itchy rash occurs several days to weeks after a sting, the rash may mean a delayed skin reaction has occurred.