Editing Sea urchin (section)

=== Injuries ===
{{main|Sea urchin injury}}
[[File:Sea-urchin-injury.jpg|right|thumb|Sea urchin injury on the top side of the foot. This injury resulted in some skin staining from the natural purple-black dye of the urchin.]]

Sea urchin injuries are puncture wounds inflicted by the animal's brittle, fragile spines.<ref name="Andrews">{{cite book |author1=James, William D. |author2=Berger, Timothy G. |title=Andrews' Diseases of the Skin: clinical Dermatology |publisher=Saunders Elsevier |year=2006 |page=431 |isbn=0-7216-2921-0 |display-authors=etal}}</ref>
These are a common source of injury to ocean swimmers, especially along coastal surfaces where coral with stationary sea urchins are present. Their stings vary in severity depending on the species. Their spines can be venomous or cause infection. [[Granuloma]] and staining of the skin from the natural dye inside the sea urchin can also occur. Breathing problems may indicate a serious reaction to toxins in the sea urchin.<ref>{{cite web|last=Gallagher|first=Scott A.|title=Echinoderm Envenomation|url=http://emedicine.medscape.com/article/770053-overview|work=eMedicine|access-date=12 October 2010|archive-date=4 December 2010|archive-url=https://web.archive.org/web/20101204174610/http://emedicine.medscape.com/article/770053-overview|url-status=live}}</ref> They inflict a painful wound when they penetrate human skin, but are not themselves dangerous if fully removed promptly; if left in the skin, further problems may occur.<ref>{{cite journal |author1=Matthew D. Gargus |author2=David K. Morohashi |title=A sea-urchin spine chilling remedy |journal=[[New England Journal of Medicine]] |year=2012 |volume=30 |issue=19 |pages=1867–1868 |doi=10.1056/NEJMc1209382 |pmid=23134402 |doi-access=free }}</ref>