Spots and bumps on the scalp are common, usually harmless and almost always made worse by the two things people instinctively do about them, which are picking and washing less. Most are inflamed hair follicles, irritated by sweat, friction, product build up or a change in shampoo. A few need proper medical attention. Knowing which is which saves weeks of guessing, and the everyday fixes are simpler than most people expect.

What causes spots and bumps on the scalp?

Inflammation of the hair follicle causes the great majority of them. Each hair sits in a small pocket of skin with an oil gland attached, and anything that blocks or irritates that pocket produces a red, sometimes tender lump. Sweat trapped under a hat, friction from a helmet, residue from styling products, a heavy conditioner pushed up to the roots, or simply going too long between washes will all do it.

Skin naturally carries yeasts and bacteria, and on a warm, damp, occluded scalp they multiply more than usual. This is why breakouts cluster along a hairline where a cap sits, or at the nape under long hair, rather than appearing evenly all over. It is not a hygiene failure and it is not contagious in ordinary circumstances.

How do you tell the common types apart?

Texture, tenderness and pattern tell you most of what you need. The table below is a guide to what people usually mean, not a substitute for a proper medical opinion when something is painful or persistent.

What everyday habits make spots and bumps on the scalp worse?

Six habits account for most avoidable flare ups, and all six are free to change.

1. Leaving a sweaty scalp unwashed. After the gym, a run, a hot commute or a day in a hard hat, rinse. Sweat plus occlusion is the classic combination.
2. Wearing the same cap or headband repeatedly. Headwear collects sweat, oil and bacteria. Wash it as often as you would wash a t shirt.
3. Rinsing badly. Conditioner and styling product left along the hairline and nape is a very common cause. Rinse for twice as long as feels necessary, and tip your head back so residue does not run over the same spots.
4. Layering dry shampoo for days. It is a useful tool occasionally, and a reliable way to build up residue when it replaces washing.
5. Applying heavy oils to the scalp. On a scalp that is breaking out, thick oils add occlusion exactly where you do not want it.
6. Picking. This is the one that causes lasting damage. A follicle that is repeatedly picked can scar, and a scarred follicle does not grow hair again.

How should you wash a scalp that keeps breaking out?

More often and more gently than you probably are. The instinct to wash less, in order to avoid drying out an irritated scalp, is understandable and usually backfires, because it leaves sebum and residue sitting in exactly the follicles that are inflamed.

• Wash every day or every other day while things are active, then settle back once it calms.
• Use a sulphate free shampoo so you clear residue without stripping the skin barrier and provoking more irritation.
• Use fingertips, not nails. Nails break the surface of bumps you cannot see and spread the problem.
• Keep conditioner to the mid lengths and ends. The scalp does not need it, and it is one of the most common blockers.
• Rinse in cooler water at the end, and rinse thoroughly. Hot water leaves skin drier and itchier.
• Let hair dry properly. Hours spent in a damp towel turban keeps the scalp warm and moist, which is the environment the whole problem thrives in.

If itching or burning is the dominant symptom rather than the bumps themselves, our guides to scalp itching from hair products and a burning scalp go through those specific causes.

When should you see a pharmacist or your GP?

A pharmacist is a good first stop for a flaky, itchy scalp and can advise on which medicated shampoo is appropriate for you, which is a decision that should be made by someone qualified rather than by an article. Go to your GP rather than the pharmacy counter if any of the following apply.

• A lump that is large, hot, very painful or growing.
• Anything weeping, crusting or spreading quickly.
• Bumps together with a fever or feeling unwell.
• Hair not returning in an area where bumps have healed, or skin there looking smooth and shiny, which can indicate scarring.
• Anything that has not settled after four to six weeks of sensible everyday care.
• Recurrent boils, particularly with diabetes or a condition affecting your immune system.

There is a good reason not to self select a medicated product for a persistent scalp problem. Several of the shampoos people reach for contain licensed medicines in the UK, and which one suits a given scalp depends on what is actually going on. That is a conversation for a pharmacist or a GP, and it is free.

Do spots and bumps on the scalp cause hair loss?

Usually not, and the distinction between three different things matters a great deal here.

• Hair loss in the follicular sense means the follicle itself stops producing a normal hair. Ordinary inflamed follicles settle without lasting harm. The exception is inflammation that scars, which destroys the follicle permanently, and that is precisely why picking and delayed medical care are worth avoiding.
• Hair shedding can rise temporarily around a sore or inflamed scalp, and it usually settles as the skin calms. It is a hair cycle response rather than damage, and the hairs come back.
• Hair breakage is the fibre snapping, and it is common here for a mechanical reason: scratching an itchy scalp with nails damages hair shafts at the root end and leaves short broken pieces that look alarming on the pillow.

So the honest summary is that the bumps themselves rarely cost you hair, while the scratching, picking and delay sometimes do. For the wider picture, our guide to keeping your scalp healthy covers the everyday care side properly.

Which products help, and which should wait?

A gentle, sulphate free cleanse used more often is the useful step. A conditioner kept off the roots is the safe companion. Everything richer can wait.

Grow Me Shampoo

Sulphate free, so it clears sweat, sebum and product residue without stripping the skin barrier. Suitable for daily use while a scalp is settling. Cosmetic support for a comfortable scalp. Vegan, made in the UK, over 5 million bottles sold since 2012.

Condition Me Conditioner

For the mid lengths and ends only, keeping the roots clear. Reduces breakage and detangling damage, which matters when you are washing more often than usual and handling hair more.

Frequently asked questions

Why do I get spots and bumps on the scalp but not on my face?

The scalp has a very high density of hair follicles and oil glands, and it spends much of the day covered by hair, hats or helmets. That combination of follicles, oil, warmth and occlusion is unusual, so it produces its own pattern of problems.

Should I stop washing my hair so often?

No, that is usually the wrong direction. Washing removes the sweat, sebum and residue that are irritating the follicles. Washing daily with a gentle sulphate free shampoo is fine, and often the fastest thing that helps.

Can I squeeze a scalp spot?

Please do not. Squeezing pushes contents deeper, makes inflammation worse and risks scarring the follicle, which is the one way an ordinary bump can permanently cost you hair in that spot.

Does hair oil help or hurt?

While a scalp is breaking out, heavy oils tend to hurt, because they add occlusion to already blocked follicles. Once things have been calm for a couple of weeks, an occasional pre wash oil is fine again for people who like it.

Could my shampoo be causing this?

It can be. A reaction to a fragrance or preservative typically appears days after starting something new, as an itchy rash rather than isolated lumps. Stop the product, keep the bottle, and show it to your GP if it does not settle.

Are scalp bumps contagious?

Ordinary inflamed follicles are not passed between people in normal daily contact. Sharing hats, combs, towels or pillows during an active flare is still worth avoiding, and fungal scalp infections, which are a different problem, can spread.

Why do they always come back in the same place?

Because the cause is usually still there. The same cap seam, the same helmet strap, the same spot where conditioner runs, or the same patch you keep scratching. Fix the mechanical cause and the pattern usually breaks.

How long should it take to improve?

An individual bump settles within a week or two. A pattern of them should be clearly improving within four to six weeks of consistent gentle washing and removing the trigger. Beyond that, see your GP rather than trying another shampoo.

Sources and references

• NHS, Dandruff, for flaking, seborrhoeic dermatitis and when a pharmacist can advise.
• NHS, Boils and carbuncles, for the warning signs that mean seeing a GP rather than waiting.
• British Association of Dermatologists information leaflets, for folliculitis, contact reactions and scarring scalp conditions.
• NHS, Hair loss, for the difference between temporary shedding and permanent follicular damage.

The short version

Spots and bumps on the scalp are almost always irritated hair follicles, driven by sweat, friction, residue and occlusion rather than by poor hygiene. Wash more often with a gentle sulphate free shampoo, keep conditioner off the roots, rinse properly, wash your headwear, pause oils and rich leave on products, and never pick. Give it four to six weeks, and see your GP sooner for anything painful, spreading, crusting or leaving smooth patches where hair no longer grows.

Watermans products are 100% cosmetic and do not treat medical hair loss. Individual results may vary. This article is general information and not medical advice. If your scalp is painful, weeping, crusting or scarring, please see your GP.