In short
If melanoma is possible, the lesion is removed with a margin and examined under a microscope. Breslow thickness — how deep it has grown — guides the next operation and whether a sentinel lymph node biopsy is discussed. Dermoscopy helps decide what to remove. Do not have a suspected melanoma shaved off. This is general information, not a diagnosis.
Speed matters. A two-week-wait dermatology referral is how NHS GPs send changing moles.
What is Breslow thickness?
It is the depth of the melanoma in millimetres. Thinner melanomas have a better outlook. It is measured by a pathologist, not by looking at the skin.
What is a sentinel node biopsy?
A test to see if the first draining lymph node contains melanoma cells. It is used for staging some intermediate-thickness melanomas. It is not always required.
Do I need CT or PET scans?
Not for most thin melanomas. Scans are used if there is a higher chance of spread. Your letter will say.
What are the key takeaways?
- Excision biopsy confirms melanoma and measures depth.
- Thickness drives the next steps.
- Not every patient needs whole-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 puts them out of reach — so a treatable cancer too often becomes a fatal one. World Aid Network funds treatment through locally-licensed oncologists for patients who cannot pay.
Frequently asked questions
Why a second operation after the biopsy?
A wider margin of skin is taken to reduce the chance of leftover cells. That is standard, not a sign the first operation failed.
Can a blood test detect melanoma?
Not as a screening test for well people.
Does WAN diagnose melanoma in the UK?
No.
This guide is general information, not medical advice. It was reviewed by the World Aid Network editorial team for accuracy against NHS and World Health Organization sources. Always speak to a GP or qualified clinician about your own health.