Sea urchin injuries - Caidr
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Sea urchin injuries

Written by Caidr's team of doctors and pharmacists based in UK | Updated: 18.07.2022 | 2 min read
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Sea urchins are black spiked marine life that are found in the rock pools along our shores. Their positioning in dark submerged spots within popular swimming spots means sea urchin spine punctures are common, particularly in feet. They cause pain and inflammation but often do not need medical treatment.

More information

Sea urchins cause injury through the physical discomfort of spines breaking off within our soft tissue but also with a mild toxin/sting that is associated with this action. The feet are usually affected due to their proximity to the seafloor but surfers who are pulled over rocks can find themselves covered in these small spines.

Generally, removal of these spines resolves the pain however spine removal is troublesome due to the thick dermis on the soles of the feet and the fragility of the spines which can splinter on pressure from tweezers.

What can I do to help in the first instance?

Firstly do not walk on the spines as this will only embed the spines further into the foot. If you have fine enough tweezers attempt to slowly remove the spines that are visible. Ensure you have rinsed the wounds well to help remove any loose foreign bodies. Soaking the feet for 30 minutes in warm vinegar can help dissolve spines and promote their rise to the surface.

The majority of superficial spines will work themselves out within a few weeks but if spines migrate deeper and become retained then they can cause significant pain long-term.

When should I see my doctor?

Large and deep spines should be reviewed by your doctor to see if they can be removed. If they cannot be removed by your doctor or the intensity of pain raises the possibility of deeper spines assessment should be in a hospital setting to allow for deep exploration sometimes using scans to assess further. If the wounds are worsening over the ensuing days with no improvement in pain or inflammation, your doctor may consider whether there could be secondary infection that may benefit from some antibiotics.

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