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Skin cancer In-depth guide

How is skin cancer diagnosed?

In short

A GP looks at the lesion and may refer you to dermatology. A dermatoscope is a lighted magnifier that shows structures under the skin surface. Many suspected cancers are biopsied or removed and sent to a pathologist. This is general information. Do not try to diagnose your own mole from photographs on the internet.

Photography helps you and the clinic see change. It does not replace an examination.

What is dermoscopy?

It is a handheld microscope for skin. It helps distinguish seborrhoeic warts, blood vessels in BCC, and pigment networks in moles.

Punch, shave or excision biopsy?

The clinic chooses a method that gets enough tissue without unnecessary scarring. Melanoma is usually excised with a margin, not shaved, when it is suspected.

Help a patient afford cancer care

Gifts go to the Cancer Emergency Appeal’s wider fund for patients who cannot pay. They do not buy a guaranteed treatment or result.

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Do I need scans?

Most BCC and SCC do not. Scans are for melanoma or SCC that might have spread. Your letter will say if further tests are needed.

Key takeaways

  • Dermoscopy plus biopsy is how most skin cancers are confirmed.
  • Suspected melanoma is excised, not ignored.
  • Most non-melanoma cases do not need body scans.

Care like this is out of reach for millions

The diagnosis, screening and treatment described here are routine in the UK. In Pakistan, Indonesia and Malaysia, poverty can put them out of reach. The Cancer Emergency Appeal raises funds towards clinically recommended care for patients who cannot pay; gifts go to the wider fund and do not buy a guaranteed treatment or result.

Frequently asked questions

Will the biopsy leave a scar?

Usually a small one. Ask about the site and stitches before you agree.

Can a GP freeze a suspected cancer?

Cryotherapy is for some diagnosed, low-risk lesions — not a substitute for examining a changing mole.

Does WAN run UK dermatology clinics?

No.

Back to the full skin cancer guide

Editorial summary of published sources. A named oncology clinician has not signed off this guide. Use it to prepare questions for your healthcare team, not to diagnose symptoms or choose treatment. Editorial responsibility: Kaiser Khan. Updated 4 October 2026.

What are the sources for this guide?

Follow the original guidance for its evidence, dates and limitations. General background references are not a clinical review of this page.

Editorial policy · Corrections and reporting an error

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