Two different things tend to get worse in winter, and they need different responses: dandruff and dry scalp. Dandruff is a common scalp condition, and health services list cold weather among the things that may make it worse. Dry scalp is skin losing moisture, and winter supplies most of the usual causes at once: cold air outside, heated air inside and long, hot showers. Changing your washing habits helps with the second. The first responds to an anti-dandruff active ingredient, and no Rinsed bar contains one. For the full picture of what dandruff is, start with dandruff explained.
- 1. Two winter problems, not one
- 2. Why can dandruff get worse in winter?
- 3. Why does winter dry out the scalp?
- 4. Dandruff or dry scalp?
- 5. What to change in winter
- 6. When to see a pharmacist or doctor
- 7. Summary
- 8. Frequently asked questions
- 9. Sources
Two winter problems, not one
Flakes in December are not automatically dandruff, and they are not automatically dry skin either. Both can show up, or get worse, as the weather turns, and it is common to have one and assume it is the other.
The responses barely overlap. Dry scalp is largely about habits and surroundings, so turning the water down and washing less often can help. Dandruff is linked to a yeast that lives on the scalp, which is why the standard advice is a shampoo with an active ingredient made for it, used as its label directs.
Why can dandruff get worse in winter?
The honest answer: health services agree that it can, but they do not say exactly why. The NHS says stress and cold weather may make dandruff worse. Mayo Clinic puts it the same way: dandruff may get worse when you are stressed or during cold, dry weather.
The clearer seasonal picture comes from seborrhoeic dermatitis, the wider condition that dandruff belongs to. DermNet, the dermatology reference, describes dandruff as an uninflamed form of seborrhoeic dermatitis on the scalp, and lists winter flares that improve in summer as a typical feature in adults. The American Academy of Dermatology says flare ups are common when the weather turns cold and dry, and that the dryness often causes them. Cleveland Clinic also lists cold, dry weather as a trigger.
Two caveats. The sources describe a pattern, not a proven mechanism, so we are not going to invent one. And summer sun is not simply the cure: DermNet links summer improvement to sun exposure, but the American Academy of Dermatology and Cleveland Clinic also list heat or too much sun as triggers. Stress is a named trigger too, but none of these sources say winter itself makes it worse.
If your dandruff flares every winter, that is a known pattern, not a sign you are washing wrong. Rinsed bars contain no anti-dandruff active. They are cleansers, and a cleanser on its own does not treat dandruff. The actives, and why one of them is no longer allowed in EU cosmetics, are covered in anti-dandruff ingredients explained and the zinc pyrithione EU ban.
Why does winter dry out the scalp?
Because winter lowers the moisture in the air, indoors and out, and many people answer the cold with longer, hotter showers. The evidence here is clearer.
- Cold, dry air. The American Academy of Dermatology and Cleveland Clinic both say low humidity and cold climates can dry out the scalp. A 2016 review in the Journal of the European Academy of Dermatology and Venereology found that low humidity and low temperatures lead to a general decrease in skin barrier function. That review looked at skin in general rather than the scalp specifically.
- Indoor heating. Mayo Clinic notes that central heating, wood burning stoves, space heaters and fireplaces all lower air humidity, which is one of the causes of dry skin it lists.
- Hot showers. Mayo Clinic lists long, hot showers or baths as a cause of dry skin. The American Academy of Dermatology names hot showers and baths, especially in cold, dry weather, as a seborrhoeic dermatitis trigger, and says hot water can dry your skin and your scalp.
- Washing often. Mayo Clinic says bathing more than once a day can remove the skin's natural oils, and Cleveland Clinic suggests washing hair less often for a dry scalp.
The same things dry the skin on your body, which is why winter tends to bring tight shins and dry hands along with a dry scalp. If that sounds familiar, see soap or shower gel for dry skin, and for the lengths of your hair, does a shampoo bar dry out your hair.
Dandruff or dry scalp?
Dandruff tends to mean larger flakes that can look oily. Dry scalp tends to mean smaller, drier flakes and a tight feeling. Cleveland Clinic sums it up in one line: excess oil causes dandruff, and loss of moisture causes dry scalp. Winter can bring both at once.
We have covered the differences in detail, along with a third lookalike, leftover product, in dandruff, dry scalp or residue. If you are not sure which you have, a pharmacist can help you tell.
What to change in winter
Most winter changes are about the water, the air and the product you already use. Here is each winter factor against both problems.
| Winter factor | Effect on dandruff | Effect on dry scalp | What to try |
|---|---|---|---|
| Cold, dry air outside | Cold, dry weather may make it worse (NHS, Mayo Clinic) | Low humidity and cold can dry out the scalp | Wear a hat outdoors in the cold, as the American Academy of Dermatology suggests for seborrhoeic dermatitis |
| Heated air indoors | Not specifically documented | Heating lowers air humidity, a known cause of dry skin | A humidifier, which the American Academy of Dermatology and Cleveland Clinic both suggest |
| Long, hot showers | Hot showers in cold, dry weather are a listed seborrhoeic dermatitis trigger | Hot water can dry skin and scalp | Warm water, five to ten minutes |
| Washing more often | Not caused by poor hygiene. Follow your anti-dandruff product's directions | Bathing more than once a day can remove natural oils | Wash less often if your scalp feels dry, and use less product |
| Stress | A listed trigger, though not a specifically winter one | Not a listed cause, though Cleveland Clinic suggests managing stress | Whatever helps you manage it |
In the shower
The American Academy of Dermatology's advice for dry skin is to keep showers to five to ten minutes and use warm water. Hot water feels better in January, which is exactly why it is worth checking. If your scalp feels tight, wash less often, use less product and rinse thoroughly.
That applies whatever you wash with. A Rinsed bar is a 3-in-1 syndet, with Sodium Cocoyl Isethionate first on the ingredient list and no saponified oils, and it goes on hair, body and face in one routine. On a winter trip, one small solid bar replaces three bottles in the bag, and the rules for the chalet shower after a day on the slopes are the same as at home: warm, short, rinse well.
Shampoo, body and face wash, all in one bar. Keep your hair and skin healthy on the go. Monoï-infused scent with a touch of vanilla. Designed for those always on the go.
At home and outdoors
Heated rooms are dry rooms. The American Academy of Dermatology suggests a humidifier to raise the humidity at home, for example in the bedroom overnight, and Cleveland Clinic suggests one for a dry scalp. Outdoors, the American Academy of Dermatology's advice for reducing winter seborrhoeic dermatitis flares is to dress for the weather, including a hat.
Hard water is a separate question from the season. Whether it plays a part in flaking is covered in does hard water cause dandruff, and if yours seems worse after the gym than after a cold walk, see dandruff and sweat.
If you use an anti-dandruff shampoo
Follow the directions on the product, in winter as at any other time. The American Academy of Dermatology notes that these shampoos need to be lathered on the scalp and some need to stay on for a few minutes before rinsing, so the label matters. The NHS suggests using one for up to four weeks to see whether it helps, and says you may need to try more than one type. A pharmacist can tell you how to use it.
When to see a pharmacist or doctor
A change of season is not a reason to keep putting up with symptoms. The NHS advises seeing a GP if any of these apply:
- You still have dandruff after using an anti-dandruff shampoo for at least four weeks
- Your dandruff is bad or your scalp is very itchy
- Your scalp is red or swollen
- You have flaky, itchy patches on your face or other parts of your body
Cleveland Clinic adds pain, swelling, or skin that starts to drain fluid, which can be a sign of infection. Anything persistent, severe, red, sore, spreading or painful is a question for a professional, not for another shampoo. Other conditions, such as psoriasis or a fungal infection, can look like a dry or flaky scalp. A pharmacist is a quick first stop and will tell you if you need to see a doctor.
Summary
Winter may make two different things worse. Dandruff may worsen in cold, dry weather, and seborrhoeic dermatitis commonly flares in winter, though the sources do not say exactly why. Dry scalp is more clearly a winter problem: cold air, heated rooms and hot showers all take moisture from the skin.
For dry scalp, turn the water to warm, keep showers to five to ten minutes, wash less often and consider a humidifier. For dandruff, use an anti-dandruff product as its label directs; Rinsed bars contain no anti-dandruff active. A hat outdoors in the cold is also suggested for seborrhoeic dermatitis. If symptoms are persistent, severe, red, sore or spreading, see a pharmacist or doctor.
Frequently asked questions
Why is my dandruff worse in winter?
The NHS and Mayo Clinic both say cold weather may make dandruff worse, and dermatology references describe winter flares as typical of seborrhoeic dermatitis, the wider condition dandruff belongs to. The exact reason is not established. Winter can also bring a dry scalp, a separate problem with similar looking flakes.
Does cold weather cause a dry scalp?
It can contribute. The American Academy of Dermatology and Cleveland Clinic both say low humidity and cold climates can dry out the scalp, and indoor heating lowers the humidity inside too. Long, hot showers and very frequent washing add to it.
Should I wash my hair less in winter?
If your scalp feels dry or tight, washing less often and using warm rather than hot water is common dermatology advice for dry skin. If you use an anti-dandruff shampoo, follow the product's directions for how often to use it.
Do hot showers make dandruff worse?
The American Academy of Dermatology lists hot showers and baths, especially in cold, dry weather, as a trigger for seborrhoeic dermatitis flares, and says hot water can dry the skin and scalp. Warm water and showers of five to ten minutes are the usual advice for dry skin.
Do Rinsed bars help with winter dandruff?
No. Rinsed bars are cleansers and contain no anti-dandruff active. If you have dandruff, use a product that contains an active made for it, follow its directions, and see a pharmacist or doctor if it does not improve.
Does wearing a hat make dandruff worse?
We found no authoritative source saying so. The American Academy of Dermatology actually suggests wearing a hat outdoors in cold weather to reduce winter seborrhoeic dermatitis flares.
When should I see a doctor about winter dandruff?
If it has not improved after at least four weeks of an anti-dandruff shampoo, if it is bad or very itchy, if your scalp is red or swollen, or if flaky patches appear on your face or body. Pain, swelling or fluid are also reasons to get checked. A pharmacist is a good first stop.
Sources
The facts in this article are based on the sources below, checked in September 2026.
- Dandruff. NHS, accessed 2026.
- Dandruff: Symptoms and causes. Mayo Clinic, 2025.
- Seborrheic dermatitis: Causes and treatment. DermNet, 2024.
- Seborrheic dermatitis: Self-care. American Academy of Dermatology, accessed 2026.
- How to treat dandruff. American Academy of Dermatology, accessed 2026.
- Is your dry scalp something more serious? American Academy of Dermatology, accessed 2026.
- Dermatologists' top tips for relieving dry skin. American Academy of Dermatology, 2026.
- Seborrheic Dermatitis: Symptoms, Causes & Treatment. Cleveland Clinic, 2025.
- Dry Scalp: Causes, Treatment & Prevention. Cleveland Clinic, 2022.
- Dry skin: Symptoms and causes. Mayo Clinic, accessed 2026.
- The effect of environmental humidity and temperature on skin barrier function and dermatitis. Engebretsen KA, Johansen JD, Kezic S, Linneberg A, Thyssen JP. Journal of the European Academy of Dermatology and Venereology, 2016.
