Sar Mein Khujli: Dandruff, Lice, Fungus or Oil Build-up?

Scratch first, diagnose later is how most scalp itch gets handled, and it’s exactly backwards. Dandruff, lice, a fungal infection and plain oil build-up all itch, and they all need a different fix.

Working through the four common causes

Scalp itch has a short list of usual suspects, and the fastest way through it is to check for the specific signs each one leaves behind, rather than guessing from the itch alone, since the itch itself feels much the same regardless of cause.

Dandruff

Loose, often oily-looking white or yellowish flakes on the scalp and shoulders, mild to moderate itch, and a scalp that may look slightly red underneath. It is linked to a normally present scalp yeast (Malassezia) reacting more than usual, along with dry skin or excess oil depending on the person. It tends to worsen in cold, dry weather and with infrequent washing, and improves with anti-dandruff shampoos containing ketoconazole, zinc pyrithione or selenium sulfide, used as directed, usually 2 to 3 times a week.

Lice

Intense, often maddening itch concentrated behind the ears and at the back of the neck, tiny nits (eggs) glued firmly to the hair shaft close to the scalp, distinct from dandruff flakes which sit loosely and brush off easily. Lice spread through direct head-to-head contact and shared combs, pillows or headscarves, and are extremely common in school-age children; they are not a sign of poor hygiene.

Fungal infection

Distinct red, scaly, sometimes ring-shaped patches, occasionally with broken hairs or a bald patch in children (tinea capitis), or greasy yellowish scale along the hairline and eyebrows in adults (seborrhoeic dermatitis, a more severe cousin of dandruff). These generally need a doctor’s assessment and often a medicated or prescription shampoo, sometimes an oral antifungal for tinea capitis, since over-the-counter dandruff shampoo alone is often not enough.

Oil build-up

An itchy, slightly tight or heavy-feeling scalp that clearly improves after a thorough wash, common with infrequent hair washing, heavy oiling left on for days, or product build-up from styling creams and gels. This is the simplest of the four to fix and the easiest to mistake for something needing medicine.

A simple decision path

1. Check the hair shaft close to the roots, especially behind the ears, for tiny, firmly attached, oval nits. If present, treat for lice first; nothing else will resolve the itch until they’re gone.
2. Look for distinct red, scaly or ring-shaped patches, or a bald patch, especially in a child. If present, see a doctor rather than trying dandruff shampoo alone.
3. If flakes are loose, white to yellowish, and brush off the shoulders easily, start with an anti-dandruff shampoo, used 2 to 3 times weekly, left on the scalp for the full time stated on the bottle, usually 3 to 5 minutes, before rinsing.
4. If none of the above and the scalp simply feels itchy with light or absent flaking, wash more regularly (every 2 to 3 days for most hair types, more often if very oily), avoid leaving oil on the scalp for more than a few hours before washing it out, and reassess after 2 weeks.
5. If itch persists past 2 to 3 weeks of trying the matching approach, or worsens, see a dermatologist rather than rotating through more home treatments.

Lice treatment, properly done

A dedicated anti-lice lotion or shampoo containing permethrin or a similar active ingredient, applied exactly as the packet directs, generally covers the initial kill. This must be followed by wet-combing with a fine-toothed nit comb through sectioned, conditioner-coated hair, checked over a light background, repeated every 3 to 4 days for about 2 weeks to catch newly hatched lice the lotion may have missed as eggs. Wash bedding, combs and headscarves in hot water, and treat all affected household members together to avoid reinfection bouncing back and forth.

Washing frequency and water temperature, sorted out

There is no single correct washing frequency for everyone; it depends on hair type, scalp oiliness, climate and styling habits. Very oily scalps often do better washed every 1 to 2 days, while drier, curlier hair types may only need washing every 4 to 5 days without worsening itch. Hot water strips natural oils faster than lukewarm water and can itself worsen an already dry, itchy scalp, so lukewarm water with a gentle, sulfate-free shampoo is a reasonable default while sorting out the underlying cause.

Shared items and reinfection

Combs, hairbrushes, pillowcases and headscarves used by someone with lice or a fungal scalp infection should be washed in hot water, ideally above 50°C, or set aside for a few days, since both lice and some fungal spores can survive briefly on shared surfaces. This single step is often the missing piece when an itch keeps returning despite otherwise correct treatment.

Myth: oiling the scalp heavily prevents dandruff and lice

Heavy oiling left on for days can actually worsen an itchy, flaky scalp by adding to build-up, and it does nothing to prevent or treat lice, which live on the hair shaft and scalp regardless of oil. A light oil massage before a wash, rinsed out the same day or within 24 hours, is a reasonable comfort habit; oil sitting on the scalp for a week is not the protective shield it’s often assumed to be.

For general hair care and colour concerns, see our grey hair and henna-indigo guide. More scalp and skin remedies are on the Desi Remedies hub.