Why does melanoma cause changing mole?

A changing mole may become darker, develop several shades, lose its even outline or grow asymmetrically. It can also become raised, crusted, itchy, tender or bleed. Changes may be subtle, which is why comparing the spot with earlier photographs can help describe what has happened.

Many changing skin marks are caused by non-cancerous conditions, irritation or ordinary mole variation. A visual change cannot establish the diagnosis. A clinician may examine the whole skin surface with a magnifying device and decide whether the spot needs removal or another test.

Book a prompt skin assessment for a mole that is changing, newly unusual or repeatedly bleeding. Note when you first noticed the change, take a clear photograph beside a scale, and avoid picking or repeatedly rubbing the area. Do not try to remove the mole yourself.

During assessment, mention previous skin cancers, significant sun exposure, family history and any other changing marks. A clinician can explain whether monitoring, a biopsy or another step is appropriate.

Arrange prompt review if a spot changes quickly, bleeds without clear injury, forms a persistent crust, becomes painful or is accompanied by a new lump nearby. Seek urgent help for heavy bleeding or signs of a spreading skin infection.

What features of this mole concern you? Should it be photographed, monitored or biopsied? How should I check the rest of my skin? When should I return if the appearance changes again?