Bumps on Scalp Australia: Lumps, Cysts and Sores Explained

Bumps on scalp skin are common and most are harmless, but they are not all the same thing. Small tender spots centred on hairs are usually folliculitis. A smooth, firm, mobile lump under the skin is most often a pilar cyst. Crusted sores that will not close, or any lump that grows, bleeds or changes, need a GP appointment rather than watchful waiting.

At a Glance

• Small tender spots sitting on individual hairs are usually folliculitis
• A smooth, firm, movable lump beneath the surface is commonly a pilar cyst
• Scale and flaking are a different problem from a discrete lump
• A sore that has not closed in a month should be examined
• Australian sun exposure makes scalp skin a relevant site for lesion checks

What Kind of Bumps on Scalp Skin Are You Feeling?

The shape and behaviour tell you more than the location does.

Small, tender, pimple-like spots that sit on a hair are almost always folliculitis — inflammation of the hair follicle, often bacterial, sometimes yeast-driven. They come in crops, respond to washing changes, and settle within days. Our guide to what causes scalp folliculitis covers the triggers, and how to treat it at home covers the wash routine.

A single smooth, firm, round lump that moves slightly under the skin and has been there for months or years is typically a pilar cyst. These are benign keratin-filled sacs, they run in families, and they are more common on the scalp than anywhere else on the body. They do not need removing unless they become inflamed, catch on a comb, or bother you.

Crusted or scabbed areas that come and go are usually the result of scratching or picking at an inflamed scalp rather than a growth in themselves. Our page on psoriasis scabs on the scalp covers that cycle.

Yeast-driven bumps are worth separating out because they behave differently — uniform, itchy, often across the hairline and upper back, and they do not respond to antibacterial approaches. Our guide to malassezia folliculitis covers that pattern.

Bumps on Scalp Skin Versus Flaking and Scale

These get conflated and they are different problems.

Scale, flaking and buildup sit on the surface and lift off. Psoriasis, seborrhoeic dermatitis and simple dry scalp all produce that, and our guides to dry flaky scalp and scalp buildup cover them.

A lump is a three-dimensional thing you can feel between your fingers. It has depth. Thick psoriasis plaque can feel raised, but it is a plate of scale rather than a discrete lump, and it has a defined edge you can trace.

The practical distinction matters because scale responds to medicated shampoo and a lump generally does not. People often cycle through several shampoos for something a shampoo was never going to shift.

Why Does My Scalp Feel Sore?

Soreness without an obvious lump is its own question.

Tenderness across a broad area is often related to tension, tight hairstyles or the aftermath of scratching, and it settles when the cause is removed. Tenderness in one specific spot more often means something is there — an early folliculitis lesion, an inflamed cyst, or a small area of broken skin.

Scalp skin has a dense nerve supply and inflammation there registers strongly, which is why a lesion that would barely register on a forearm can be genuinely painful on the head.

Persistent, well-localised scalp pain without a visible cause is worth mentioning to a GP, particularly if it is new and you are over 50 — that combination has causes unrelated to skin that are worth excluding.

When Bumps on Scalp Skin Need Checking

Most do not. Some do, and these are the ones.

A sore or crusted area that has not healed within about four weeks. Scalp skin recovers well, and a lesion that does not close is the single most useful signal to act on. This matters more in Australia than most places — the scalp receives substantial sun exposure and is a site people rarely examine.

Any lump that is growing, hard, fixed in place rather than mobile, bleeding, ulcerated, or has changed in colour or shape.

Bumps accompanied by hair loss in the same area, particularly if the skin looks scarred or shiny, since some conditions damage follicles permanently and early treatment matters.

An inflamed, boggy, tender swelling that oozes — this can be a kerion, a fungal infection of the scalp that needs oral treatment, especially in children. Medicated shampoo alone will not resolve it, which is why assessment matters rather than another product.

Recurring boils that scar or discharge — our guide to when folliculitis becomes a boil covers recognising the change.

Related Guides

Learn More — safely removing scalp scale

Compare — when an itchy scalp is not dandruff

Shop — scalp care and medicated shampoos

FAQ

Should I squeeze a bump on my scalp?
No. Squeezing folliculitis spreads bacteria to nearby follicles, and squeezing a cyst can rupture it under the skin and cause a painful inflammatory reaction.

Are pilar cysts dangerous?
They are benign. They are removed for comfort or cosmetic reasons rather than for safety, though a cyst that becomes hot, painful or rapidly enlarging should be seen.

Why do I keep getting bumps after washing my hair?
Product residue, occlusive styling products and washing with very hot water can all irritate follicles. Sweat trapped under a hat or helmet does the same.

Can a shampoo clear a lump?
A medicated shampoo can help folliculitis and settle inflammation. It will not resolve a cyst or any other structural lump.

Is a bump that hurts more worrying than one that does not?
Not necessarily. Painful bumps are usually inflammatory and often settle. A painless lump that is growing or fixed is the more concerning pattern.

Should I get scalp lesions checked at a skin check?
Yes. Ask specifically for the scalp to be examined, since it is easy to overlook under hair and receives significant sun exposure.

Can hair products cause them?
Heavy oils, waxes and dry shampoo can occlude follicles and contribute to folliculitis in susceptible people.

Do I need to stop dyeing my hair?
Not usually, though dyeing over inflamed or broken scalp skin is uncomfortable and can worsen irritation. Wait until it settles.

Key Takeaways

• Tender spots on individual hairs are usually folliculitis; smooth mobile lumps are usually cysts
• A lump has depth; scale sits on the surface and lifts off
• Localised soreness often means a specific lesion rather than general inflammation
• Any sore not healed in four weeks needs examination
• Growing, fixed, bleeding or changing lumps need prompt assessment

When to Seek Medical Advice

See a GP for any scalp sore, crust or ulcer that has not healed within about four weeks, or any lump that is growing, hard, fixed in place, bleeding or changing in appearance. The scalp is a high sun-exposure site that people rarely inspect, and non-healing lesions there warrant examination rather than observation.

Seek assessment promptly if a swelling becomes boggy, hot, tender or starts discharging, if there is fever, or if neck lymph nodes are swollen and sore. In children, a scaly patch with broken hairs and a tender swelling suggests a fungal infection requiring oral treatment.

Also see a GP if bumps are accompanied by hair loss in the same area, if boils keep recurring, or if scalp pain is persistent, well-localised and new — particularly over the age of 50. Healthdirect covers lumps and when to seek help, and DermNet sets out the folliculitis picture. You can call healthdirect on 1800 022 222 to speak to a registered nurse.

Australian Psoriasis and Eczema Supplies stocks medicated and gentle shampoos that support scalp comfort alongside any treatment your doctor recommends.

This article is general educational information only and is not a substitute for personalised medical advice. A scalp lesion that will not heal should be assessed by a GP.