Experts Say You Should Stop Believing These Seborrheic Dermatitis Myths

A flaky scalp seems like it should have a straightforward fix: Add moisture, wash less, maybe try whatever scalp oil the internet is currently obsessed with. But if those flakes come with persistent itching and inflammation, you might have seborrheic dermatitis — and some of that advice could make it worse. This chronic inflammatory skin condition tends to affect areas with plenty of oil-producing glands. The scalp is a common spot, but it can also show up around the eyebrows, ears, beard, and chest. Dandruff falls on the milder end of the same spectrum. “It does not have the inflammation that we see with seborrheic dermatitis,” says Gloria Lin, M.D., a board-certified dermatologist at Schweiger Dermatology Group based in New York City.

The condition is surprisingly common: A recent study estimated its global prevalence at roughly 4.4%. A yeast called Malassezia normally lives on healthy skin without symptoms, but in people with seborrheic dermatitis, the skin can react with inflammation even when there isn’t an unusually large amount of yeast present. Everyday factors like stress, sweating, and your hair-washing routine can also influence flare-ups, making the condition more complicated than a simple yeast problem. That complexity leaves plenty of room for misconceptions, so ahead, our experts clear up some of the most common myths.

Myth #1: “It’s just a dry scalp.”

Flakes look dry. Your scalp might feel dry. Naturally, reaching for something moisturizing seems logical. But seborrheic dermatitis and ordinary scalp dryness aren’t interchangeable, and the distinction matters when deciding how to treat it.

​“Dryness is usually secondary to the inflammation,” says Chang Son, M.D., a board-certified dermatologist and founder of SCN Dermatology based in New Jersey. In other words, that dry feeling can result from irritated skin rather than the underlying reason you’re flaking.

Lin explains that an ordinarily dry scalp may feel tight and have fine flakes, with little redness or inflammation. Seborrheic dermatitis, meanwhile, can involve larger flakes, more noticeable inflammation, and itching. It also favors oily areas: “This is where the yeast Malassezia likes to hang out,” she says.

​That doesn’t necessarily mean you can diagnose yourself by inspecting a flake. Lin says that telling the conditions apart can be difficult, especially when you can’t easily see most areas of your scalp. If you’re tempted to take matters into your own hands with scalp oils and other topical products, it can “make the seborrheic dermatitis worse,” says Lin. Depending on the product, they may create conditions that favor the yeast, contribute to buildup, or irritate the skin themselves.

Myth #2: “I should wash my hair less.”

When your scalp feels dry and flaky, washing less can seem like the obvious move — after all, wouldn’t more shampooing strip away oil and make it even drier? But with seborrheic dermatitis, stretching out wash days can let oil and product buildup accumulate, backfiring and worsening symptoms. “Build-up of too much oil can contribute to the flares,” says Son. Lin adds that underwashing can be particularly troublesome for people who sweat a lot or use plenty of styling products.

​With regular shampoo, there’s no universal number of wash days to aim for. “The ideal hair washing schedule can be dependent on the person, hair type, skin type, and lifestyle,” says Lin. If you have an oily scalp or fine, straight hair, shampooing daily may work well for you. Coarse, curly, or coily hair may feel better with less frequent washing. The goal is to clear away buildup without washing so often that you irritate the scalp’s protective barrier.

Medicated shampoo, however, comes with a treatment schedule. Lin says prescription antifungal shampoos, such as ketoconazole and ciclopirox, are typically used three times a week during flare-ups, though you should follow your prescribed directions. Using one only once or twice a month may not be enough to control active symptoms. A gentle, hydrating shampoo can handle cleansing between treatments. There’s no need to pile on exfoliating ingredients like salicylic acid. They can help loosen flakes, but they don’t directly target the yeast involved. You may still need a medicated shampoo for maintenance, even after a flare settles down.

​If several wash days a week would leave your hair dry or damaged, your dermatologist can help you find solutions. Lin points to leave-on solutions, foams, and creams that treat the scalp without requiring another trip to the shower.

Myth #3: “It means I have too much yeast — and it’s contagious.”

Finding out that yeast is involved can make seborrheic dermatitis sound like something you’ve picked up and need to eradicate. But Malassezia is a normal resident of the skin. Its presence alone doesn’t explain why some people develop inflammation, and others don’t. “Having seborrheic dermatitis does not necessarily mean you have an abnormal amount of yeast on the skin,” Lin says. Some studies have found higher amounts in people with the condition, she explains, while others have found quantities similar to those in people without it.

Son emphasizes that the inflammatory response matters. Even when yeast overgrowth is involved, “it is the inflammation that is triggered by them that is the main cause for disease manifestation,” he says. Put simply, the trouble isn’t only how much yeast is there; it’s also how your immune system reacts.

​That helps explain why antifungal treatments can be useful without making seborrheic dermatitis contagious. “It is not infectious or contagious since Malassezia is part of the normal skin flora,” says Lin. You can’t catch the condition from someone’s flakes.

Myth #4: “Cutting out sugar, dairy, or gluten will fix it.”

Spend enough time looking up seborrheic dermatitis on online forums, and someone will tell you to stop eating sugar, dairy, or gluten. But do you really need to rethink your meal plan to get your scalp under control? “There is no robust evidence to suggest that elimination diets can prevent or cure seborrheic dermatitis,” says Lin.

Son adds that researchers have shown a possible connection with high-glycemic diets — foods that raise blood sugar quickly — but haven’t established a clear link. “Gluten has not been directly associated with seborrheic dermatitis,” he says. So cutting out bread or giving up your morning latte isn’t a proven fix.

You might notice that certain foods seem to coincide with your flare-ups. Dr. Lin says some patients report dietary triggers, while others find that stress or changing seasons aggravate their symptoms. It’s worth noting patterns and bringing them up to your dermatologist, but someone else’s success story doesn’t mean you need to follow the same restrictions — or that changing your diet can replace treatment.

​Myth 5: “If treatment worked, it wouldn’t come back.”

Like dandruff, seborrheic dermatitis can come and go. Even when the flakes disappear, the underlying condition remains. “Seborrheic dermatitis is a chronic issue,” says Lin. “While it may not be active or present all the time, it can recur.” So if symptoms return, it doesn’t automatically mean your treatment failed — you may still need it to keep things under control. “Many patients become frustrated that it can come back if they stop the treatments, as the medications are a maintenance therapy rather than a cure,” she says.

The next step is finding a maintenance plan that works for you. That might mean adjusting how often you use a medicated shampoo or trying a leave-on solution, foam, or cream, which stays in contact with your skin longer than a shampoo you rinse away. Your dermatologist can help you decide what to keep using once a flare settles down, so you can stay ahead of itching and flakes instead of waiting for them to return.

Presented by BDG Studios