Scalp Skin Cancer: How to Spot the Signs and Prevent It

The scalp is one of the most sun exposed parts of the body. The crown and top of the head face straight up and take in a huge amount of UV radiation over the years. At the same time, this is exactly the area hidden under the hair. You can barely see it yourself, and neither can other people. That combination makes the scalp a place where skin changes are easily missed. This is the real problem. A suspicious mole on your arm catches your eye when you get dressed, a rough patch on the face is noticed while washing. On the scalp, by contrast, a change can grow for months without anyone setting eyes on it. With skin cancer, though, every week counts: the earlier something is noticed, the gentler the treatment can be. That is why it is worth deliberately including the head in your skin checks, even though it is awkward to examine. In this article we explain which forms of skin cancer occur on the scalp and hairline, how to recognise the warning signs, how to check your scalp even with a full head of hair, and how to protect this sensitive zone from UV.

In principle, any form of skin cancer can develop on the scalp. The most common is so called non melanoma skin cancer, which includes basal cell carcinoma and squamous cell carcinoma. Both tend to appear where the skin has taken in a lot of sun over a lifetime, that is on the head, face, ears and neck. Non melanoma skin cancer is the most common cancer overall, but it usually grows slowly and generally stays confined to one spot. Basal cell carcinoma often shows up as a small, pearly or glassy nodule, sometimes with fine blood vessels, that bleeds easily and does not heal properly. Squamous cell carcinoma frequently develops from a precursor called actinic keratosis. That is a rough, scaly patch you tend to feel rather than see, and it is typical of the bald or thinly haired scalp. Rarer but more dangerous is melanoma. It can also arise on the scalp, where the hair makes it especially easy to overlook. The NHS notes that melanoma can appear anywhere on the body, including areas that are hard to see. That is all the more reason to check your head regularly.

The most important warning sign is a spot that simply will not heal. A small sore, a nodule or a crust on the scalp that lasts for weeks, keeps opening up or bleeds when you comb your hair should be checked by a doctor. Many people first put this down to a scratched spot or a harmless graze. But anything that does not close up after several weeks should no longer be brushed aside. Other signs of possible non melanoma skin cancer or its precursor include: rough, scaly areas that feel coarse and come back after the scale comes off, skin coloured or reddish nodules with a shiny surface, and spots that bleed easily. At the hairline, forehead and temples such changes are often easier to see than in the middle of the haired scalp. For melanoma, the ABCDE rule applies on the scalp too: look out for a mole that is asymmetrical, has an irregular border or several colours, is larger than about six millimetres, or changes over time. Especially suspicious is a pigmented spot that is new, grows, itches or bleeds and looks different from your other moles.

People whose scalp takes in a lot of direct sun are at higher risk of scalp skin cancer. This applies above all to men with a bald head or thinning hair, because without a protective covering of hair the UV hits the skin unhindered. A wide parting or a receding hairline also exposes sensitive zones that rarely come to mind. The other risk factors apply to the head just as to the rest of the body: a fair skin type that burns easily, many sunburns in the past, older age, a weakened immune system, for example after an organ transplant, and a personal or family history of skin cancer. People who work or play sport outdoors build up a particularly high UV dose over the years. If several of these points apply to you, protect and check your scalp especially consistently. That holds even when your skin is otherwise unremarkable, because the decisive UV exposure often lies decades in the past.

Examining your own scalp feels unusual, but with a little practice it is quite doable. The easiest way is in good light with two mirrors: hold a hand mirror so it shows the back of your head in the large mirror. Using a hair dryer on a cool setting or your fingers, part the hair strand by strand so you can work across the scalp in sections. Go about it systematically: forehead and hairline, parting, both sides, the back of the head and the neck. Your eyes are not the only help. Run your fingertips over the scalp and pay attention to rough spots, nodules or crusts that you feel rather than see. A second person can judge the back of your head far better than you can. In fact it is often hairdressers who first notice an unusual spot on the head. If someone points one out, take the hint seriously. A photo record makes it easier to compare over time. With DermCheck you can upload a photo of a suspicious spot and get an AI based first assessment within seconds. That is a helpful orientation for everyday use and a prompt to look more closely - it does not replace a medical diagnosis. If you are unsure or a finding looks unusual, the spot belongs in the hands of a specialist.

The best protection is not to build up the crucial UV dose in the first place. A head covering is the most reliable option. A wide brimmed hat shades the head, ears and neck at once, whereas a baseball cap leaves the parting and ears partly exposed. For leisure and sport there are hats and cloths made of fabric with a stated UV protection factor. Where the scalp is exposed, sunscreen helps. On a bald head, a wide parting and the hairline, apply a sunscreen with a high protection factor and reapply it, especially when sweating and in water. For haired areas, special sprays or gels work well because they spread without a greasy film. On top of that, avoid the intense midday sun and seek shade when the radiation is strongest. Remember that UV also acts on cloudy days and in the car through the side windows. Consistent protection over many years is the most effective prevention - and, as a bonus, it spares the skin from premature ageing.

See a doctor if a spot on your scalp does not sit right with you: a sore that will not heal, a rough or bleeding patch, or a mole that is new or has changed. When skin cancer is a possibility, the rule is to have it checked once too often rather than too late. An appointment is straightforward and brings clarity. In the clinic the doctor first examines the spot with a dermatoscope, a special magnifier that reveals structures the naked eye cannot see. During a skin check the whole body is examined, and the scalp is explicitly part of that. Do point out suspicious spots on your head so they get a close look. If there is any suspicion, the spot is removed in a minor procedure and examined under the microscope. Only this laboratory test gives a definitive answer. In the UK there is no routine population screening for skin cancer, so it is important to act yourself. See your GP if a spot on your scalp changes or will not heal, and ask for a referral if you are worried. People at higher risk, for example with a bald head, frequent sunburn or a history of skin cancer, should have their skin checked more closely.

This article is for general information and to raise awareness of the early detection of skin cancer. It replaces neither medical advice nor a diagnosis. Whether a change on the scalp is harmless or needs treatment can ultimately only be judged by a doctor, if necessary through examination of the tissue under the microscope. AI based tools such as DermCheck can offer a first orientation and sharpen your attention for changes. They do not make a medical diagnosis. For any uncertainty, any unusual change and for the warning signs described here, seeing a doctor is the right step.