“The ocean heals my skin” is a refrain heard often from eczema patients in South Florida, and it is not purely anecdotal. The possible beneficial effects of seawater on atopic dermatitis have a plausible biological basis.
Potential Benefits of Seawater
Magnesium chloride. Dead Sea water (historically used for eczema therapy) is extraordinarily rich in magnesium chloride. Regular seawater contains lower concentrations, but some research suggests that magnesium chloride absorbed through the skin may improve skin hydration and reduce inflammation.
Antimicrobial effects. Salt concentration in seawater may temporarily reduce Staphylococcus aureus colonization, a known eczema aggravator.
UV exposure. Ocean swimming in South Florida combines saltwater immersion with sun exposure. UV light has well-documented anti-inflammatory effects on eczema and psoriasis.
Psychological benefit. The calming experience of swimming in the ocean reduces stress, itself a significant eczema flare trigger.
Potential Risks
Barrier disruption. Salt draws water out of the skin through osmosis. Extended exposure can paradoxically dehydrate the skin, particularly in patients with severely compromised barriers.
Post-swim drying. Air-drying after ocean swimming concentrates salt on the skin surface as water evaporates, which can irritate broken skin. Rinsing with fresh water immediately after swimming is important.
Sun exposure. The UV exposure during ocean swimming is substantial in South Florida, representing real skin cancer risk without adequate sun protection.
Practical Guidance
- Brief ocean swims (20–30 minutes) followed by an immediate freshwater rinse and moisturizer application is a reasonable approach for most eczema patients
- Apply SPF 30+ before entering the water
- If you notice worsening after ocean exposure, your barrier may be too compromised
NuLine’s eczema studies may offer treatments that better protect your skin barrier.