Miami Beach Skin: Is Algae Inflaming Summer Pores?

By Franklin Everett Shaw

May 8, 2026

The sting of salt water, the feel of sand between your toes – that’s the Miami Beach experience. But sometimes, paradise comes with a price: an itchy, red rash that seems to appear out of nowhere. It’s not always sunburn; it could be an unwelcome encounter with algae. This summer, let’s arm ourselves with the knowledge to identify, prevent, and treat algae-related skin inflammation, so you can enjoy the sun and surf without the sting.

Miami Beach’s vibrant ecosystem is home to a variety of algae, some harmless, others less so. Two culprits are particularly notorious for causing skin irritation: Lyngbya majuscula and certain species of cyanobacteria, also known as blue-green algae.

Lyngbya majuscula, a type of filamentous cyanobacteria, often forms large, dark mats that can detach and float in the water. Contact with Lyngbya can cause a condition known as “swimmer’s itch” or “seaweed dermatitis.” The symptoms include:

Red, itchy bumps or welts on the skin.
A burning sensation.
Possible blistering in severe cases.

Cyanobacteria blooms, while visually striking (often turning the water a murky green or reddish-brown), can also release toxins that irritate the skin. These blooms are more common during periods of warm water and nutrient runoff.

Distinguishing between algae-related rashes and other skin irritations (like jellyfish stings or sunburn) can be tricky. Algae rashes often appear in areas where swimwear traps water against the skin, such as under the straps of a swimsuit or around the waistline. Jellyfish stings, on the other hand, tend to be more localized and accompanied by immediate, sharp pain. Sunburn, of course, affects areas directly exposed to the sun.

Prevention is always better than cure. Here’s a proactive skincare routine to minimize your risk of algae-related skin inflammation:

Pre-Swim Barrier: Apply a thick layer of a water-resistant barrier cream or ointment before entering the water. Look for products containing ingredients like zinc oxide or dimethicone. A good option is CeraVe Healing Ointment, readily available at Walgreens on Alton Road. This creates a physical barrier, reducing direct contact between your skin and potential irritants.
Protective Clothing: Consider wearing a rash guard or wetsuit, especially if you’re planning on spending extended periods in the water. These garments provide a physical barrier against algae and other marine irritants.
Post-Swim Rinse: Immediately after swimming, rinse your body thoroughly with fresh water. Don’t just towel off and let the saltwater dry on your skin. This is crucial. Use the public showers available at Lummus Park or South Pointe Park.
Gentle Cleansing: Use a mild, fragrance-free soap to gently cleanse your skin after rinsing. Avoid harsh soaps or scrubs that can further irritate the skin. Cetaphil Gentle Skin Cleanser, available at most drugstores in Miami Beach, is a reliable choice.
Hydration is Key: After cleansing, apply a generous amount of a fragrance-free moisturizer to help restore your skin’s natural barrier.

Despite your best efforts, you might still develop a rash. Here’s how to manage it:

Topical Corticosteroids: Over-the-counter hydrocortisone cream (1%) can help reduce inflammation and itching. Apply a thin layer to the affected area several times a day. You can find this at any CVS in Miami Beach.
Antihistamines: Oral antihistamines, such as diphenhydramine (Benadryl) or loratadine (Claritin), can help relieve itching. Be aware that diphenhydramine can cause drowsiness.
Cool Compresses: Apply cool, wet compresses to the affected area for 15-20 minutes at a time to soothe the skin.
Avoid Scratching: Scratching can worsen the rash and increase the risk of infection. Keep your fingernails short and clean.
Oatmeal Baths: Colloidal oatmeal baths can help relieve itching and inflammation. You can find colloidal oatmeal at most pharmacies.

When should you see a dermatologist? If your rash is severe, doesn’t improve with over-the-counter treatments after a week, shows signs of infection (pus, redness, swelling), or is accompanied by other symptoms (fever, difficulty breathing), it’s time to seek professional help.

Here are a few highly recommended dermatologists in the Miami Beach area:

Dr. Anna Avaliani: Specializes in cosmetic and medical dermatology. Located on Collins Avenue.
Dr. Loretta Ciraldo: Known for her expertise in skin cancer prevention and treatment.
Miami Dermatology & Laser Institute: A comprehensive dermatology practice with multiple specialists.

One common mistake is assuming that all rashes are the same and treating them with the same remedies. A sunburn requires different treatment than an algae-related rash. Another pitfall is neglecting to rinse off immediately after swimming. The longer the algae remains in contact with your skin, the greater the chance of irritation.

Another challenge is identifying the specific type of algae causing the problem. While you might not be able to identify it visually, paying attention to the conditions (e.g., presence of large mats, discolored water) can provide clues.

Finally, remember that algae blooms are often unpredictable. Stay informed about local water quality reports and advisories. The Miami-Dade County Department of Health regularly monitors water quality at beaches and posts updates online. Before heading to the beach, check their website for any warnings or advisories.

By understanding the risks, adopting a proactive skincare routine, and knowing when to seek professional help, you can minimize your risk of algae-related skin inflammation and enjoy all that Miami Beach has to offer. Don’t let a little rash ruin your summer fun!