We report a case of sting wound of the oral mucosa caused by sea urchin spines. A 40-year-old woman visited our hospital because of gingival paresthesia of the right palatal first molar region after eating some octopus sashimi. A foreign body in the gums was self-extracted immediately after the pain was felt. The foreign body was a black spine of about 10mm. Antibacterial agents were administered to prevent secondary infections, and no residual disorders were observed. Scanning electron microscopy revealed that the foreign body was a sea urchin spine.
