A coral cut is a physical injury sustained by coming into contact with the hard coral skeletons that make up the exterior of individual coral organisms, which make up coral reefs. Commonly, a coral cut causes bleeding, pain, and swelling at the site of the cut. Coral cuts can become infected and require medical care if they are not treated properly, especially if coral fragments, bacteria, proteins, or toxins from the coral remain in the wound. To avoid infection, it is recommended to scrub a coral cut with soap and water immediately, then apply antibiotic ointment and cover the wound with a bandage. It is important to seek immediate medical attention if receiving a severe coral cut, for example if the coral injury causes heavy bleeding, injuries to bone or other tissue, or festering ulcers and sores.

Coral and coral reefs are made up of thousands of tiny organisms called polyps. These polyps produce calcium carbonate which hardens and forms the coral's exterior skeleton. Coral reefs are mainly found in tropical and subtropical oceans and are popular destinations for swimmers, divers and snorkelers. The surfaces and protrusions of coral organisms are often sharp enough to cut skin and underlying tissue even if only brief contact occurs and even if one is wearing protective gear such as a wetsuit.

The most important thing after suffering a coral cut is to make sure the wound is cleaned thoroughly. Vigorous cleaning and scrubbing of the wound with a brush, soap, and water is recommended. Flushing the wound with plenty of fresh water also helps clean out any coral debris, and one can also apply saline solution or antiseptic solution to the injury. A mixture of equal amounts of hydrogen peroxide and water can also be used to flush and clean a coral cut. The application of acetic acid or isopropyl alcohol can help if there is a stinging sensation.

After thorough cleaning, it is recommended to cover the coral cut with a bandage. Rinsing the coral cut daily and applying antibacterial ointment three to four times per day is also recommended to avoid infection. Over-the-counter pain medication, such as acetaminophen or ibuprofen, can be used for pain relief if needed. In some cases, coral cuts can lead to serious bacterial infections with increasing redness and tenderness around the wound. Sometimes, oral antibiotics are needed to treat the infection, and it is important to consult a doctor to get the proper treatment.