How Common Is Basal Cell Carcinoma and Who Gets It?

Basal cell carcinoma is the most common cancer in people of European descent, and its incidence has climbed substantially over the past few decades. In a U.S. population study from Olmsted County, Minnesota, the age-adjusted rate reached about 360 per 100,000 person-years in men and roughly 293 per 100,000 in women.¹ Those numbers describe a single region, but the global picture tells a similar story of steady growth. Who develops BCC, and why some people face a much higher risk than others, involves a tangle of UV exposure history, skin phenotype, geography, immune status, and genetics that is worth understanding in detail.

How Many People Are Diagnosed Each Year

Globally, the incidence of BCC in adults 55 and older rose from about 135 per 100,000 in 1990 to around 230 per 100,000 by 2005, then largely stabilized through 2021. Men consistently develop BCC at higher rates than women. Male incidence climbed from roughly 152 per 100,000 in 1990 to about 290 per 100,000 in 2005, while female incidence went from around 126 to 190 per 100,000 over the same period.² Because most cancer registries do not mandate reporting of non-melanoma skin cancers the way they do for other malignancies, the true numbers are almost certainly higher than published estimates suggest.

Part of the apparent rise in incidence may reflect better detection rather than a genuine biological increase. When Germany rolled out population-wide skin cancer screening in 2008, reported non-melanoma skin cancer incidence jumped roughly 40 to 47 percent almost immediately, depending on sex.³ That kind of spike, tied directly to screening activity, shows how sensitive incidence statistics are to how hard you look. It does not mean the underlying risk is not real, but it does mean headline numbers should be read with that caveat in mind.

UV Exposure Is the Dominant Risk Factor

Sunlight, and specifically the ultraviolet-B portion of the spectrum, is the single most important environmental cause of BCC. UV radiation damages DNA in skin cells, triggering mutations in genes that normally keep cell growth in check. Both long-term cumulative sun exposure and intermittent intense exposure (think weekend beach trips or holiday sunburns) contribute to that damage.⁴ Proteomic research has found that the molecular signature UV drives in skin cells aligns more closely with BCC than with squamous cell carcinoma or melanoma, suggesting BCC is especially UV-dependent among skin cancers.⁵

Sunburns at any age raise your risk. A meta-analysis found that having ever been sunburned in childhood increased BCC risk by about 43 percent. The dose matters too: every five sunburns per decade in childhood nearly doubled BCC risk, and every five sunburns per decade in adulthood more than doubled it.⁶ This is not a threshold effect where one bad burn triggers cancer. It is cumulative, and each additional episode stacks the odds further.

Where You Live Changes Your Risk

Geography matters because UV intensity varies with latitude, altitude, and cloud cover. A large study of U.S. women found that living in states with higher UV indices raised BCC risk even after adjusting for personal characteristics like hair color, tendency to burn, and mole count. Women in states with a UV index of 7 or higher had about a 33 percent greater risk of BCC compared to women in states with a UV index of 5 or below (measured at age 30).⁷ Australia, with its combination of high UV, an outdoor culture, and a predominantly fair-skinned population, has long recorded some of the world’s highest BCC rates. But you do not need to live near the equator to develop BCC. Incidence is substantial in northern Europe and the northern United States, driven in part by intermittent high-intensity recreational sun exposure and indoor tanning.

Indoor Tanning and Early-Onset BCC

Tanning beds and sunlamps produce concentrated UV radiation, and research consistently links their use to BCC. A population-based study found that people who had ever used indoor tanning had about 60 percent higher odds of developing BCC before the typical age of diagnosis, with the risk climbing for every year younger a person was at first exposure.⁸ The association held across different device types, including sunlamps, beds, and booths.⁹

A prospective cohort study looking at the combined influence of natural sunlight and tanning bed use found that people with both high sun exposure and tanning bed use during high school or college had about 53 percent higher BCC risk than those with low sun exposure and no tanning. If they also had a history of severe sunburns during those years, the risk increased to about 62 percent above baseline.¹⁰ The teen and young adult years seem to be a particularly vulnerable window, likely because skin cells are dividing rapidly and UV-damaged DNA is more readily propagated.

Skin Type, Hair Color, and Other Physical Traits

Fair skin is one of the strongest personal risk factors. A meta-analysis of pigmentary characteristics found that people with fair skin had about twice the risk of BCC compared with darker-skinned individuals. Red hair carried a similar doubling of risk, and people whose skin burns and never tans also faced about double the odds.¹¹ Childhood freckling has also been associated with higher risk, even after accounting for other pigmentary traits.¹²

That said, the relationship between pigmentation and BCC is not perfectly straightforward. A Danish case-control study found that while skin type mattered (people with skin that burns easily and tans with difficulty had about 2.3 times the risk), hair color and eye color on their own were not significantly different between BCC patients and controls once skin type was accounted for.¹³ So it is really skin sun-sensitivity, more than just cosmetic coloring, that drives risk.

BCC in Darker Skin

BCC is far less common in people with darker skin, but it does occur. When it does, it often looks different from the classic pearly, translucent nodule described in textbook photos of fair-skinned patients. In darker phototypes, BCC frequently presents as pigmented nodules, pigmented patches or plaques, ulcers, or even scar-like lesions.¹⁴ A study of 60 BCCs in patients with skin phototypes IV and V found that the most common features under dermoscopy were maple leaf-like areas, blue-white veils, and ulceration, features that differ from what clinicians are trained to look for in lighter skin.¹⁵ These atypical presentations contribute to diagnostic delays, which means BCC in darker-skinned patients can be more advanced at the time of diagnosis.

Age and Sex Patterns

BCC is overwhelmingly a cancer of older adults. In a Polish population study spanning 16 years, the average age at diagnosis was about 66 for both men and women. The largest cluster of cases fell in the 70-to-75 age group. Patients younger than 25 were extremely rare, making up just three cases out of 945.¹⁶ Men and women are both affected, though men develop BCC at somewhat higher rates, likely reflecting differences in occupational and recreational sun exposure over a lifetime.

BCC in young adults is uncommon but not impossible. A U.K. registry study found that people aged 15 to 34 accounted for about 1.2 percent of all BCC cases.¹⁷ When BCC does appear in young patients, it often prompts a search for underlying genetic conditions or immunosuppression. A Turkish case series of early-onset BCC found that six out of 32 patients had an identifiable risk factor such as Gorlin syndrome, xeroderma pigmentosum, or a history of organ transplantation. The remaining 26 had no known additional risk factors, and none of those patients experienced metastasis or recurrence.¹⁸ The reassuring finding there is that BCC in young people without an underlying syndrome does not seem to behave more aggressively.

Where on the Body BCC Tends to Appear

BCC overwhelmingly favors sun-exposed skin. The head and neck are the most common sites across studies, accounting for roughly 41 percent of BCC cases in one New Zealand dermatology referral analysis, followed by the trunk at about 27 percent.¹⁹ Within the head and neck, the face carries the highest density of tumors for both sexes and across all histological subtypes.²⁰ One exception: the superficial subtype of BCC in men, where the back of the trunk was nearly as common as the neck. That pattern makes sense when you picture men working or exercising shirtless, exposing the upper back to repeated UV.

Outdoor Work and Occupational Exposure

People who work outdoors get more cumulative UV over their lifetimes, and a systematic review and meta-analysis of 23 studies confirmed that outdoor workers had about 43 percent higher odds of developing BCC compared with indoor workers.²¹ The association was stronger at lower latitudes, where UV radiation is more intense year-round. Interestingly, a Turkish study found that BCC in indoor workers sometimes developed earlier than in outdoor workers, though the outdoor workers’ tumors tended to be more aggressive subtypes.²² The likely explanation is that intermittent intense UV exposure (weekend or holiday sun binges by people who are otherwise indoors) can initiate BCC at a younger age, while chronic daily exposure accumulates the kind of damage that drives more infiltrative growth patterns.

Immunosuppression and Organ Transplant Recipients

People with weakened immune systems face a dramatically elevated risk of skin cancers. Organ transplant recipients take drugs that suppress the immune system to prevent organ rejection, and one consequence is that their skin loses much of its ability to repair UV-induced DNA damage. In a cohort of over 1,000 solid-organ transplant recipients, about 12 percent developed skin cancer. Squamous cell carcinoma made up the majority of those cancers (70 percent), with BCC accounting for roughly a quarter.²³ The immunosuppressive drugs, particularly calcineurin inhibitors, appear to impair the nucleotide excision repair pathway, effectively creating an acquired version of the DNA repair deficiency seen in the genetic condition xeroderma pigmentosum.²⁴ For transplant patients, vigilant skin surveillance and aggressive sun protection are not optional extras.

Genetic Conditions That Cause Multiple BCCs

Gorlin syndrome, also called nevoid basal cell carcinoma syndrome, is a rare inherited condition that predisposes people to developing multiple BCCs, often starting in adolescence or young adulthood. It is caused by mutations in the PTCH1 gene, which normally helps regulate cell growth through what is known as the Hedgehog signaling pathway.²⁵ When PTCH1 is knocked out by mutation, cells lose a critical brake on proliferation, and BCCs can appear by the dozens over a lifetime. Beyond skin tumors, Gorlin syndrome often involves jaw cysts, skeletal anomalies, and occasionally childhood brain tumors.²⁶

Even outside of Gorlin syndrome, the Hedgehog signaling pathway is central to BCC development. The vast majority of sporadic (non-inherited) BCCs also show abnormal activation of this pathway, usually through acquired mutations in PTCH1 or related genes.²⁷ This understanding has led to targeted drugs called Hedgehog pathway inhibitors, which are now used for advanced or inoperable BCCs that cannot be treated with surgery alone.

Once You Have Had One, You Are Likely to Get Another

One of the least appreciated facts about BCC is how often it recurs, not in the same spot, but as an entirely new tumor somewhere else on the body. About a third of people who develop one BCC will go on to develop at least one more during their lifetime.²⁸ A study tracking over 1,000 BCC patients found that a second BCC appeared at a median of three years, with individual three-year risk ranging from 7 to 28 percent depending on personal risk factors.²⁹ Looking out further, the estimated risk of developing at least one new skin cancer was about 35 percent at three years and 50 percent at five years after a first non-melanoma skin cancer, with new tumors tending to be the same cell type as the original. Number of prior skin cancers, visible sun damage, and sun sensitivity were the strongest predictors.³⁰

This recurrence pattern means that a first BCC diagnosis is not a one-time event to deal with and forget. It marks the start of an ongoing need for skin checks, typically annually but sometimes more frequently depending on how many tumors you have had and how quickly they appeared.

What Treatment Costs Look Like

Most BCCs are small and slow-growing, and treatment is straightforward: a quick office procedure, a few stitches, and you are done. But costs diverge dramatically depending on where the tumor sits and how advanced it is. For a small superficial BCC on the cheek or scalp, curettage or cryosurgery runs roughly $143, while standard surgical excision costs about $210. Mohs micrographic surgery, a more precise layer-by-layer technique often used on the face, jumps to around $1,200.³¹ At the extreme end, a giant BCC (larger than 10 centimeters with aggressive behavior) that requires targeted drug therapy can cost well over $100,000, with vismodegib estimated at roughly $140,000 and the immunotherapy cemiplimab at over $184,000.

Location near the eyes adds another layer of complexity and cost. Patients with extensive periocular BCC (around the eye) averaged about $37,000 in total annual healthcare costs and required significantly more outpatient visits, surgeries, and a longer interval between procedures than patients with more limited disease.³² None of this means a BCC diagnosis is financially catastrophic for most people, since the overwhelming majority are caught small and treated cheaply. But the economic burden across the population is enormous simply because BCC is so common.