How to treat hydroid and jellyfish stings

Soft corals wreck

Diving in tropical conditions has it’s benefits, the main one being delightfully warm water. No need to squeeze in and out of Sharkskins and 6mm semi-dry wetsuits, or the even more cumbersome dry suits. I for one, prefer pulling on a damp shortie than a damp full length suit for the second or third dive of the day.

And then of course there’s the beautiful coral formations you usually find, and colourful tropical fish.

Soft corals in Thailand

But shorties have their downside, that being mainly that there’s less protecting you from the elements – from sharp coral, jellyfish and my major foe: hydroids or soft corals.

On this trip, I made the mistake of fiddling with my camera settings on my descent, instead of first checking my buoyancy. There was a fair bit of surge so I was being pushed and pulled a bit.

The result? I landed knees-first into a bed of beautiful purple and pink soft corals.

Hydroid stings

The stinging sensation is immediate, both upper legs burn, and they continue to burn throughout the rest of the 60-minute dive despite the cool water, and despite me alternating between rubbing them and pretending to ignore them.

So what have I learned room this? Buoyancy. Get it right.

And treatment?

  1. Don’t rinse the stings in fresh water. This will open the stings up and let the poison penetrate further.
  2. First thing you should do is grab some vinegar – from the kitchen, the first aid kit, wherever, and start rinsing the stings with it. My attentive Thai dive guide had grabbed the vinegar and some tissues before even taking his tank off, and was dabbing my knees within seconds of us clambering back on deck.
  3. Let that vinegar soak in for a few minutes.
  4. When your legs are dried (air-dried), take your wetsuit off and have a freshwater shower.
  5. Having dried yourself, reapply vinegar and let it dry.
  6. At that point, apply something like Stingose to smooth the stinging sensation. I’m using something called Fenistil, the main ingredient of which is Dimethindene maleate.
  7. If (like me) the stings cover a fair patch of skin, it’s also a good idea to take an antihistamine.

Within a few hours you should notice the swelling around the stings recede, so you’re just left with red spots that look like a bad case of localised measles.

After a day or so, the stinging sensation will be replaced by itching – keep applying the Stingose/Fenistil, and maybe take another antihistamine.

And next time you go diving in a shorty, check your buoyancy first, then your camera!

Especially where there’s a bit of current or surge. And hydroids.