Reef cuts, coral and tropical infection

Anyone who surfs reef breaks collects cuts. Most are minor and heal without incident. A meaningful minority turn into infections that are genuinely serious, take weeks to resolve, and occasionally require hospital treatment — and the difference is largely determined in the first hour after the injury.

Why reef wounds are different

Three things happen at once. The wound is contaminated with organic material — living coral tissue, algae, bacteria and small fragments of calcium carbonate that lodge in the tissue. The water is warm, which suits the bacteria that live in it. And the injured person typically goes back in the water, keeping the wound wet, soft and continuously re-exposed.

Marine bacteria are also not the organisms that most general-purpose advice is aimed at. Certain warm-water species can cause fast-moving, severe soft tissue infections, particularly in people with compromised immune systems or liver disease. This is a real, documented risk, not folklore.

What to do immediately

Get out of the water. Not at the end of the session. The single most effective thing you can do for a reef cut is not spend another ninety minutes marinating it.

Scrub it. This is the part people avoid and it is the part that matters. The wound needs mechanical cleaning — clean fresh water, ideally under some pressure, and physical scrubbing with a clean cloth or gauze to remove embedded material. It hurts. Do it anyway. Coral fragments and organic debris left in a wound are what drive the infection.

Irrigation volume matters more than any antiseptic. A large amount of clean water, pushed through, beats a dab of iodine on a dirty wound every time.

Look for fragments. Reef leaves pieces behind. Tweezers, good light, and patience. If something is deep and you cannot get it out, that is a reason to see a clinician rather than a reason to leave it.

Do not close it. Resist the urge to tape a contaminated wound shut. Sealing bacteria inside is how a superficial cut becomes an abscess. Cover it lightly with a clean dressing that lets it drain.

Then keep it dry

This is the hard part on a surf trip, because the whole point of the trip is being in the water.

A reef cut that keeps getting wet and soft will not heal, and the risk stays elevated the entire time. Waterproof dressings help but they are not a licence to surf all week on an open wound. Sometimes the right answer is losing two or three days of the trip in order to not lose the rest of it plus a week at home.

Change the dressing at least daily, more if it gets wet, and look at the wound each time you do.

The signs that mean stop and see someone

Spreading redness, particularly if it extends outward from the wound in streaks. Increasing pain after the first day, especially pain that seems disproportionate to the size of the injury. Swelling and heat. Pus. Fever, chills or feeling generally unwell. Reduced movement in a nearby joint.

Pain out of proportion to the appearance of the wound is the one to take most seriously. It is a recognised early sign of aggressive deep tissue infection, and it can progress quickly.

In remote locations, this is a reason to start moving toward medical care rather than waiting to see how it looks tomorrow. Antibiotic choice for marine infections is not the same as for ordinary skin infections, which is another argument for seeing an actual clinician rather than working through whatever is in your bag.

Sea urchins, stonefish and the other specifics

Urchin spines break off in the skin and are brittle. Some can be dissolved or worked out over days; deep ones near joints need removal. Soaking in water as hot as you can tolerate without scalding helps with pain from several marine stings and envenomations.

Anything involving a suspected venomous fish sting — stonefish, scorpionfish, stingray — is a medical situation, not a first aid one. Hot water immersion for pain, and go.

Prevention, briefly

Know the tide. Most reef injuries happen at low tide when the same wave breaks over half the water depth. Learn the exits and the deep channel before you need them.

Reef booties are unglamorous and they prevent the most common injuries. Fall flat rather than deep, and cover your head.

Carry a proper wound kit on a reef trip: irrigation syringe, gauze, tweezers, non-adherent dressings, tape. Not a strip of plasters.

And if you are travelling somewhere remote, know before you go where the nearest clinic is and how long it takes to get there. That is a five-minute task at home and an impossible one with a fever.