Scalp Seborrheic Dermatitis Flares After South Florida Pool Season

If your scalp has been driving you crazy since pool season kicked into high gear, you're not imagining it. Chlorine, sun, sweat, and constant wet-to-dry cycling on your scalp are a near-perfect recipe for stirring up seborrheic dermatitis, and we see a predictable wave of patients coming in with worsening flakes, redness, and itching right about now. Here's what's actually happening. Seborrheic dermatitis is caused by an overactive yeast called Malassezia that lives on everyone's scalp, feeding off oil production. Chlorine strips your scalp's natural oils and disrupts its barrier, which sounds like it should help — less oil, less yeast food, right? Unfortunately, it works the opposite way. A damaged barrier triggers your skin to overcompensate with more oil, your scalp dries out and gets irritated from the chemicals, and the combination creates ideal conditions for Malassezia to thrive. Add in constant sun exposure drying out the skin further, sweat trapped under hats or swim caps, and the humidity that never seems to let up around here, and you've got a scalp that's inflamed on multiple fronts at once. **Is seborrheic dermatitis contagious?** This is one of the most common questions we get, and the answer is no. Seborrheic dermatitis isn't contagious — you can't catch it from a pool, a shared towel, or another person, and you can't give it to someone else. The yeast involved lives on nearly everybody's skin without causing problems; it's only when certain triggers (like chlorine exposure, heat, stress, or hormonal shifts) throw things out of balance that symptoms show up. So if your scalp is flaking and a family member's isn't, it's not because you "caught" something from them. **Psoriasis, seborrheic dermatitis, or something else?** One reason flare-ups like this linger longer than they should is that people assume it's dandruff, treat it with an over-the-counter shampoo for a few weeks, get discouraged when it doesn't fully clear, and give up. But scalp conditions aren't one-size-fits-all. Psoriasis and seborrheic dermatitis can look remarkably similar — both cause scaling, redness, and itch — but they respond to different treatments, and using the wrong one can leave you stuck in a loop of partial improvement and frustration. We've written in detail about how to tell scalp eczema and psoriasis apart, and the short version is: a trained eye (and sometimes a quick exam) saves you months of guessing. **Why pool season specifically makes it worse** A few things compound during the months South Florida spends in and out of the water: - Chlorine exposure repeatedly dries and irritates the scalp, breaking down its protective barrier - UV exposure on the scalp — especially for anyone with thinning hair or a part that gets sun — adds another layer of irritation - Wet hair under hats or left to air-dry in humid air keeps the scalp in a prolonged damp state that yeast loves - Swim caps and tight ponytails trap sweat and product against the scalp for hours If this sounds familiar, you're in good company — this is one of the most common scalp complaints we treat at our Broward office this time of year. **What actually helps** Over-the-counter medicated shampoos with ketoconazole, selenium sulfide, or zinc pyrithione can make a real difference when used consistently — not just occasionally when things get bad. But if you've been using one for a month with little change, it's time for a prescription-strength option, which your dermatologist can tailor to how severe your flare is and how your scalp has responded to treatment in the past. Rinsing hair with clean water immediately after swimming, applying a light, non-comedogenic scalp oil before pool days, and avoiding scalding-hot water on the scalp (which strips oil even further) all help limit the damage chlorine does in the first place. **When to come in** If your scalp is cracking, bleeding, spreading onto your forehead or ears, or simply not responding to anything you've tried, it's worth getting an actual diagnosis rather than cycling through drugstore shelves. Dr. Ayar and the team see this exact pattern constantly during pool season across our Miami, Parkland, and Tamarac offices, and most patients leave with a clear plan and real relief within a couple of weeks. If you're searching for a dermatologist in Sebastian, FL or anywhere else in South Florida and your scalp just won't quit flaking, don't wait out the rest of pool season hoping it resolves on its own. A quick visit can get you the right diagnosis and a treatment plan that actually works with your routine, not against it.