Malignant Melanoma.

Alternative names: Melanoma, skin cancer, cancerous mole.

What is it?

Malignant Melanoma is a skin cancer accounting for around 3% of skin cancer in the UK. It is a malignant tumour arising from the melanocytes – the cells that produce brown pigment and moles. When melanocytes become malignant they form melanoma, but a pre-cancerous variant called lentigo maligna exists. In the early stages, melanoma can be slow-growing, in later stages it has the potential to spread (or metastasise) to other areas of the body.

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What does it look like?

Melanomas tend to resemble a mole that is undergoing changes in size, shape or colour. They may become lumpy or ‘nodular’ and even ulcerate with bleeding. Sometimes they occur in a pre-existing mole, but around half the time they arise in an area or normal skin.

large malignant melanoma

Things to look out for:

A: Asymmetry – the mole looks unusual, asymmetrical or irregular
B: Border – the border becomes blurred, ill-defined or irregular
C: Colour – more than 2 colours appear in the mole including brown, black or light areas giving a mottled appearance. A very dark or black appearance can occur
D: Diameter – if a mole is enlarging it should be reviewed

How might it affect me?

Pre-melanoma (lentigo maligna) and the earliest phase of melanoma (in-situ melanoma) are almost always cured with surgery. For melanoma beyond these early stages, it is the depth into the skin that the melanoma reaches that tells us how the disease might behave. This depth is termed the ’Breslow thickness’. The Breslow thickness will determine whether you require a simple excision or further more complex surgery including lymph gland biopsy.

The degree of spread a melanoma has undergone will be classified by stages:
Stage I: Localised to the original site only
Stage II: Localised to the skin only – the original site plus local skin spread
Stage III: Spread to the nearby lymph glands
Stage IV: Spread to the internal organs of the body

What are the treatments?

All melanomas are treated by excision. The tumour is then assessed under the microscope and the next step will depend on the Breslow thickness. With the diagnosis confirmed, a further operation will be required to excise the scar (wide local excision). This extent of this wide local will depend on the Breslow thickness (as does the likelihood of spread or recurrence). If this is greater than 1 mm, a biopsy of the lymph glands will also be required. Should there be melanoma present in the lymph glands, further surgery will be required.

Remember that the earlier your melanoma is diagnosed
and treated, the less the cosmetic disfigurement and
the less chance of recurrence or spread.

For more information on malignant melanoma, please see the British Association of Dermatologists website melanoma advice leaflets for stage 1stage 2stage 3, and stage 4 melanoma.

Did you know?

Most moles are not a cause for concern and present a purely cosmetic problem. However, moles can occasionally undergo changes that lead to them becoming cancerous.

Acne is a common condition characterised by blackheads, whiteheads and cysts. It affects the greasy and hair-bearing areas such as the face, chest and back.

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