Itchy, Flaky Scalp: Dandruff or Dry Scalp?

Dry scalp or seborrheic dermatitis

These need opposite treatments, so this is worth getting right before you buy anything.

	Genuinely dry scalp	Seborrheic dermatitis (dandruff)
Flakes	Small, white, dry, powdery	Larger, yellowish, greasy, sometimes stuck in patches
Scalp underneath	Tight, may feel dry elsewhere too	Often pink or red, sometimes shiny
Pattern	Worse in winter, better in humidity	Persistent, flares with stress, illness and cold weather
Elsewhere	Dry skin on body too	Often flaking beside the nose, in the eyebrows, behind the ears, on the chest
Response to oil	Improves	Gets worse. Malassezia feeds on the lipids
Treatment	Gentler shampoo, less frequent washing, moisture	Antifungal shampoo, used properly

The tell that settles it for most people is flaking beside the nose or in the eyebrows. Dry scalp does not do that. Seborrheic dermatitis does, because malassezia thrives wherever there are a lot of oil glands.

Washing less to treat flaking is one of the most common mistakes. Seborrheic dermatitis feeds on scalp oil, so leaving the scalp unwashed for longer makes it considerably worse, not better.

How to actually use a medicated shampoo

Most people who say medicated shampoo did not work for them were using it as shampoo. It is a topical treatment that happens to be in a shampoo bottle.

Part the hair and apply to the scalp, not the length. The length is not the problem.
Massage in with fingertips, not nails.
Leave it on for five minutes. This is the step that matters, and rinsing straight off is why it appears not to work.
Rinse, then condition the length separately so it is not stripped.
Use it two or three times a week during a flare, then once a week or fortnight to keep it away.
Rotate between two different actives if one stops working after a few months.

Ketoconazole 1%. The strongest over-the-counter antifungal option and the usual first choice.
Zinc pyrithione. Widely available, gentler, good for maintenance.
Selenium sulfide. Effective, though it can discolour lighter or colour-treated hair.
Salicylic acid. Removes scale rather than treating the cause, useful alongside an antifungal when there is thick buildup.
Coal tar. Slows skin cell turnover, effective, with a strong smell and staining risk.

Textured, coily and protective-styled hair

Standard dandruff advice assumes washing several times a week, which does not suit most textured hair and is bad advice for anyone in braids or locs.

Use a medicated shampoo as a targeted scalp treatment on wash day rather than switching your whole routine to it.
Applicator bottles with a nozzle let you reach the scalp between braids without disturbing the style.
Diluting a medicated shampoo in an applicator bottle makes it easier to distribute and rinse from a protective style.
Follow with a proper deep conditioner on the length, since antifungal shampoos are drying.
Heavy greases and oils on a flaky scalp usually worsen it. This is the piece of traditional advice most worth reconsidering if flaking is persistent.

If a style is causing itching, tightness or bumps at the hairline, that is tension rather than dandruff, and it needs the style loosened rather than a shampoo.

When it is something else

Scalp psoriasis produces thicker, silvery, well-defined plaques that often extend past the hairline onto the forehead or neck, and it needs different treatment. Tinea capitis, a fungal infection, causes scaly patches with hair loss and is more common in children, and it requires oral medication because shampoo does not reach the hair shaft.

See a doctor if a medicated shampoo used properly has not helped after four to six weeks, if there is hair loss in the affected areas, if there are defined patches or thick scale, if it is painful, or if the skin is broken and weeping.

Get a routine for a flaky scalp

What to buy

Products in the directory that fit what this guide describes. Every one has its own page with who it suits and what to consider instead.

Product	Type	Price	Why it is here
Neutrogena T/Gel Therapeutic Shampoo (coal tar)	Scalp care	$11	Coal tar, for scaly flaking that a normal anti-dandruff shampoo hasn't touched. Alternate it with Nizoral rather than using both at once.
Nizoral Ketoconazole 1% Shampoo	Scalp care	$16	Actual medicated dandruff treatment. Twice a week for flaking that lotions and oils won't fix.
Curlsmith Scalp Stimulating Booster + Shampoo	Cleanser	$28	Made for the itch and flaking that builds up under braids, wigs, and long stretches between washes.
Briogeo Charcoal + Tea Tree Scalp Shampoo	Cleanser	$32	For a scalp that flakes and gets oily at the same time. The combination most shampoos handle badly.
Any silicone brand Silicone Scalp Massager	Tool	$9	Gets shampoo onto the scalp rather than the lengths, which is where it is meant to go. Also lifts buildup that fingers alone leave behind.

Ordered by how directly each one addresses the problem, then by price. Some links earn a commission, which has no bearing on what appears here or in what order.

Questions people also ask

How do I know if I have dry scalp or dandruff?

Dry scalp produces small, white, powdery flakes and usually comes with dry skin elsewhere. Dandruff produces larger, yellowish, greasy flakes over pink skin, and often flakes beside the nose and in the eyebrows too. Oil improves dry scalp and makes dandruff worse.

Why does oiling my scalp make flaking worse?

Because most persistent flaking is seborrheic dermatitis, driven by malassezia, a yeast that feeds on lipids. Adding oil feeds it. This is the most common reason a flaky scalp gets steadily worse despite regular treatment.

How long should I leave dandruff shampoo on?

Five minutes on the scalp before rinsing. It is a topical treatment that happens to be in a shampoo bottle, and rinsing it straight off is the main reason people conclude it does not work.

Should I wash my hair less if my scalp is flaking?

Usually the opposite. Seborrheic dermatitis feeds on scalp oil, so washing less makes it worse. Wash the scalp regularly with a medicated shampoo and condition the length separately.

Can I treat dandruff in braids or locs?

Yes. Use an applicator bottle with a nozzle to get diluted medicated shampoo directly onto the scalp between sections, leave it several minutes, and rinse thoroughly. Avoid heavy greases, which tend to worsen it.

Why your scalp is itchy or flaking