# How is melanoma diagnosed?

> Source: World Aid Network — https://worldaidnetwork.org/cancer/melanoma/tests

## 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.

## Key takeaways

- Excision biopsy confirms melanoma and measures depth.
- Thickness drives the next steps.
- Not every patient needs whole-body scans.

## Related pages in this guide

- Overview: https://worldaidnetwork.org/cancer/melanoma
- ABCDE: https://worldaidnetwork.org/cancer/melanoma/symptoms
- Biopsy: https://worldaidnetwork.org/cancer/melanoma/tests
- Treatment: https://worldaidnetwork.org/cancer/melanoma/treatment

## 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.

## How you can help

World Aid Network funds cancer treatment for patients who cannot pay in Pakistan, Indonesia and Malaysia. Donate at https://worldaidnetwork.org/appeal/cancer-emergency or https://worldaidnetwork.org/donate?cause=cancer-treatment&appeal=cancer-emergency

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This is general information, not medical advice, published by World Aid Network. Always consult a qualified clinician about your own health.