Biscayne Bay is one of South Florida's most iconic bodies of water. People kayak it, jet ski it, fish from its shores, and sometimes end up in it unexpectedly — whether that's from a boating mishap, a jet ski accident, or an incident near the waterfront around 2 Biscayne Blvd. Whatever brought you into contact with the bay, your skin may have something to say about it afterward.
And those skin reactions? They're worth taking seriously.
What's Actually in Biscayne Bay Water?
Biscayne Bay is a beautiful estuary, but like most urban coastal waterways in South Florida, it carries a mix of saltwater, stormwater runoff, boat fuel residue, and bacteria — especially after heavy rain or in areas near marinas and waterfront roads. Depending on where you enter the water and what's been happening weather-wise, you may be exposed to bacteria, fungi, and environmental irritants that your skin is not prepared for.
This isn't meant to scare you off the bay. It's just the reality of swimming in or near any urban South Florida waterway. Your skin is your body's first line of defense, and it takes the hit before anything else does.
Skin Reactions People Experience After Bay Water Exposure
After unexpected or extended contact with Biscayne Bay water — from a Biscayne Bay accident, a jet ski wipeout, or even just wading in — dermatologists in Miami regularly see a handful of specific skin issues:
Swimmer's Itch and Skin Rashes
This is one of the more common complaints after exposure to South Florida's natural waterways. Swimmer's itch is caused by a reaction to microscopic parasites that can live in warm, shallow water. The result is an itchy, bumpy rash that appears within hours of water contact and tends to affect exposed skin. It usually resolves on its own, but severe cases or rashes that keep getting worse deserve a closer look. Our page on
swimmer's itch and skin rashes from South Florida waters goes deeper on how to tell what you're dealing with.
Folliculitis
Warm, bacteria-rich water is a setup for folliculitis — an infection of the hair follicles that shows up as clusters of small red or white-tipped bumps. It often appears on the torso, legs, or arms after water exposure and can be itchy or mildly painful. In South Florida's heat and humidity, it can escalate faster than you'd expect. If you're seeing that kind of breakout after spending time in the bay,
our guide to folliculitis in South Florida can help you understand what's going on and when to come in.
Cellulitis and Wound Infections
If you were injured during a Biscayne Bay accident — say, a jet ski collision, a fall onto a dock, or contact with a boat hull — any open wound that was exposed to bay water needs attention fast. Warm, brackish water is full of bacteria that don't belong in a cut or scrape. Cellulitis, a bacterial skin infection that causes redness, swelling, and warmth around the wound, can develop quickly and spread. This is not something to wait out.
Wound care in South Florida already comes with added risk from the climate — add contaminated bay water and the risk goes up significantly.
Fungal Infections
Prolonged moisture exposure — especially if you stayed in wet clothing after a water incident — can trigger fungal skin infections. South Florida's heat makes this worse. Tinea, ringworm, and similar infections can appear anywhere fabric stays damp against the skin.
Fungal skin infections in South Florida are more common than most people think, and they often get misidentified as something else before a dermatologist takes a look.
Contact Dermatitis
Some skin reactions after water exposure aren't from the water itself — they're from what washes off the boats, docks, or equipment you came into contact with. Boat fuels, cleaning products, dock coatings, or even the wetsuit or life jacket you were wearing can trigger contact dermatitis: a red, inflamed, itchy rash that appears where the irritant or allergen made contact.
Contact dermatitis reactions are easy to miss because they look similar to other rashes, but the treatment is different depending on what caused them.
The Jet Ski Factor
Biscayne Bay jet ski activity is everywhere — from tours and rentals near the causeway to private watercraft launched from Bayside and surrounding areas. Jet ski accidents in and around the bay are more common than most people realize, and they come with a specific set of skin risks.
High-speed water contact causes a kind of friction burn that can look mild at first but becomes painful and infected if not cleaned and treated properly. If you wiped out at speed, check your skin carefully — not just for obvious cuts, but for areas where the water essentially pressure-washed your skin. Those spots are vulnerable to infection and need proper wound care.
Beyond accidents, regular jet ski riders spend extended time in direct South Florida sun with significant wind exposure, both of which accelerate UV damage. If you're on the water frequently near 2 Biscayne Blvd or anywhere along the bay, your skin is accumulating damage even on cloudy days.
South Florida's boating and fishing culture carries real melanoma risk, and the same applies to anyone spending significant time on a personal watercraft.
When Should You See a Dermatologist?
Not every rash after a swim in the bay needs a doctor visit. But there are some signs that mean you shouldn't wait:
- A rash that keeps spreading or getting redder after 48 hours
- Swelling, warmth, or red streaks around a wound
- Fever following water exposure or an injury
- Blistering or skin that looks like it's breaking down
- A rash that doesn't respond to over-the-counter treatments within a week
- Any open wound that was submerged in bay water
If you're not sure what you're looking at, that's reason enough to call. Skin conditions caught early are almost always easier — and less expensive — to treat.
What to Do Right After Bay Water Exposure
Before you even get to the dermatologist's office, a few simple steps can make a real difference:
**Rinse off promptly.** Fresh water and mild soap, as soon as you're out of the water. This reduces the time bacteria and irritants stay on your skin.
**Don't scratch.** If you're already itchy, scratching introduces new bacteria and can turn a surface-level reaction into an infection.
**Change out of wet clothes.** Sitting in a wet bathing suit or rashguard for hours is an invitation for folliculitis and fungal infections.
**Document what you're seeing.** Take a photo of the rash or irritation when it first appears. This is genuinely helpful for your dermatologist to see the early presentation, even if it's already progressing by the time you come in.
**Watch the wound.** If you were injured, clean it with fresh water, apply antibiotic ointment, cover it, and watch it closely for signs of infection.
Dermatology Experts Sees This Regularly
At Dermatology Experts, our Miami patients come to us with skin conditions connected to everything this city has to offer — including its waterways. Dr. Angelo Ayar and the team have seen the full range of what South Florida water exposure can do to skin, and we take those concerns seriously without making you feel like you're being dramatic for asking.
Whether you're dealing with a rash that appeared after a Biscayne Bay accident, a jet ski wipeout, a swim near 2 Biscayne Blvd, or just an afternoon on the water that didn't go as planned — we're here to help you figure out what's going on and get it taken care of.
Our Miami office is easy to reach, wait times are short, and we'll give you straight answers without the runaround. That's what we're here for.
If something on your skin doesn't look right after water exposure, don't ignore it. Give us a call or request an appointment online. It's usually a quick fix — but only if you don't wait too long.
