Coral formations occur in tropical and subtropical waters.
Because the formations are immobile, injury occurs after accidental contact leaving a small amount of animal protein and calcareous material in the wound. The small, harmless-appearing cut may quickly develop into an infected wound. Local spreading redness of the skin suggests expanding infection and requires immediate medical attention. Oral antibiotics are usually recommended to prevent infection. If infection develops, continue antibiotics for at least 5 days after all signs of infection have cleared.