KILLER jellyfish-like creatures able to inflict permanent scars through their sting have been spotted on a popular beach.
Tourists heading to the beach on Channel Island Jersey, have been warned to watch out for the deadly Portuguese man o-war.
The nasty critters have been spotted washed up ashore in St Ouen’s Bay.
The rare man o-war looks like a deflated balloon with long blue tentacles that can stretch almost 30 feet
People are urged to watch out as the predators' tentacles can wrap around unsuspecting swimmers.
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Long polyps contain invisible capsules loaded with dangerous venom able to kill small fish and crustaceans.
Although it's rarely deadly to people, the powerful sting can cause an allergic reaction resulting in painful scars and welts on exposed skin.
Resembling a Portuguese warship under full sail the man o'war can be easily confused for a jellyfish.
But unlike the small creatures, this one can be blue, violet or pink and it can lurk up to six inches above the waterline.
Originally from the Caribbean, they have been dragged along the North Atlantic ocean to the coastline posing severe risks to beachgoers.
Islanders are urged not to touch them and report any sightings to the Environment Department.
Jersey Department of Health said the pain from a Portuguese man-o-war sting typically lasts 15 to 20 minutes and it should be treated differently to a jellyfish sting.
People stung are advised to rinse the area with vinegar or hot water with a hot pack for 45 minutes to remove the tentacles.
Experts are urging to never use urine to relieve the sting as it can make it worse and cause a severe infection.
Instead, the wound should be treated with anaesthetic gels or pain relief creams.
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The warning comes as another painful jellyfish was spotted on Irish beaches.
The Irish Coast Guard urged swimmers to be vigilant when visiting beaches after it received reports of people being stung by lion's mane jellyfish.
