Clinical manifestations after injury by spines of the sea urchin only have been reported in France,1,2 but today interest in the new sport of skin diving adds greater significance to this report dealing with the case of a skin diver.
Skin divers, when fishing under water, may lose their exact sense of distance and frequently strike their hands, especially fingers, on the rocks where these echinoderms are anchored. Other injuries have occurred with patients walking in the sea sand, where sea urchins may rarely also be found. The entry of the spine into the skin is accompanied by pain, erythema, and sometimes edema, which subside after a few hours. Granulomatous nodular lesions are slow developing, the latent period being between 2 to 12 months. Lesions may be seen in any age group, although they are more common in young adults. The nodules may be single or multiple depending on
ROCHA G, FRAGA S. Sea Urchin Granuloma of the Skin. Arch Dermatol. 1962;85(3):406–408. doi:10.1001/archderm.1962.01590030104017