Minor to severe pain the the site of the embedded spine
They commonly break off, causing hyperpigmentation of the skin and secondary infection
Venomous spines and pedicellariae generally cause much more severe pain and may be accompanied by systemic signs and symptoms with a significant envenomation including pruritus, nausea, vomiting, abdominal pain, respiratory distress, paresthesias, muscle weakness, and hypotension
Rarely severe envenomations can lead to death
They commonly break off, causing hyperpigmentation of the skin and secondary infection
Sea urchins
Toxins
Tapeworm
Ciguatera
Felon
Scombroid
Bougie
Tetrodotoxin 