Lifetime Sun Exposure Skin Cancer Risk Assessment

Ultraviolet exposure is the largest modifiable cause of skin cancer, and the damage is cumulative — childhood summers, a handful of bad burns, a few seasons of sunbeds and years in a sunny climate all add to the same account. This assessment builds a lifetime UV exposure profile and separates the parts you cannot change from the parts you still can.

Quick answer

Lifetime UV exposure raises skin cancer risk in two different ways: intense intermittent exposure — holiday burns, sunbeds, childhood sunburn — is most strongly linked to melanoma, while steady cumulative exposure from years outdoors drives basal and squamous cell carcinoma. Past exposure cannot be undone, but current protection still lowers future risk.

This questionnaire assesses personal and environmental risk factors such as family history, UV exposure and skin characteristics. It does not analyse photographs and cannot tell you whether an individual mole is cancerous.

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1.How much time did you spend outdoors as a child and teenager?
2.Did you have any blistering sunburn before the age of 18?
3.How many blistering sunburns have you had in total?
4.Have you had a peeling or blistering burn in the last five years?
5.Have you used sunbeds or tanning beds?
6.How many years have you lived in a high-UV country or region?
7.In summer, how many hours a week are you outdoors between 10am and 4pm?
8.Do you have regular outdoor hobbies (sport, gardening, water sports, hiking)?
9.How often do you use SPF 30+ on exposed skin in summer?
10.Do you use protective clothing, a wide-brim hat or shade at peak UV?

What your result means

Read your profile as five separate accounts. Childhood exposure and sunburn history are historical — they set a floor you cannot lower. Artificial tanning and cumulative exposure are partly historical and partly ongoing. Current protection behaviour is entirely within your control, and it is the domain worth acting on first: consistent SPF 30+, shade at peak UV and covering up measurably reduce new UV damage even in people with heavy past exposure.

High cumulative exposure also changes what to look for. Alongside moles, watch for rough scaly patches, persistent red areas and sores that do not heal within four to six weeks on the face, ears, scalp, forearms and hands — the sites that take the most lifetime dose.

What this assessment cannot tell you

It cannot diagnose anything, it cannot tell you whether a particular mole or lesion is cancerous, and it cannot replace an in-person skin examination. Risk-factor profiling and lesion assessment are two separate questions — a low factor load never rules out a suspicious spot, and a high one never means a spot is malignant.

If you have a spot you are worried about, use the AI mole checker for a photo-based assessment, and see a GP or dermatologist for anything that is changing, bleeding or failing to heal.

How UV exposure translates into skin cancer risk

Childhood exposure counts twice

UV damage in childhood and adolescence carries disproportionate weight, partly because skin cells are dividing faster and partly because it front-loads a lifetime of accumulated mutations. A single blistering sunburn before 18 is a recognised melanoma risk factor in its own right.

Intermittent burns versus steady exposure

Melanoma tracks with intermittent, intense exposure on skin that is not habitually sun-adapted. Basal and squamous cell carcinoma track with chronic cumulative exposure on permanently exposed sites. Two different patterns, two different cancers — which is why the profile above splits them.

Sunbeds

The WHO classifies UV-emitting tanning devices as Group 1 carcinogens. Use starting before age 35 carries the clearest excess melanoma risk, and there is no protective "base tan" benefit.

Protection that actually changes the number

Daily SPF 30+ applied properly and reapplied, a wide-brim hat, UV-blocking clothing and shade between 10am and 4pm. To see how fast you burn today in your location, use the safe sun exposure calculator, which works from the live UV index and your skin type.

Frequently asked questions

Can past sun damage be reversed?

Accumulated DNA damage cannot be undone, but reducing further exposure lowers the rate at which new damage accrues, and treating precancerous actinic keratoses reduces progression risk. Improving protection is worthwhile at any age.

How many sunburns does it take to raise melanoma risk?

Risk rises with the number of blistering burns rather than at a single threshold. Five or more blistering sunburns is the figure most often quoted for a substantially elevated melanoma risk.

Are sunbeds worse than the sun?

Tanning devices deliver concentrated UVA doses that can exceed midday summer sun. The WHO classifies them as Group 1 carcinogens, and use before age 35 shows the clearest excess melanoma risk.

Does a base tan protect me?

No. A tan is a sign of DNA damage and offers protection equivalent to roughly SPF 3 at best — far below the SPF 30+ recommended for meaningful protection.

Does this assessment analyse sun-damaged skin from a photo?

No. It only profiles your exposure history. If you have a specific sun-exposed spot that concerns you, use the AI mole checker for a photo-based assessment.

Sources

Medically reviewed by Dr. Tomasz Grzelewski, MD, PhD. Last reviewed 2026-08-15.