What should you know about blue melanoma?

Melanin located deeper in the skin can make a lesion appear blue, grey, or blue-black. Some harmless moles and other pigmented marks can share these shades, so a blue colour is not proof of cancer. Concern rises when a mark is new, changing, asymmetric, unevenly coloured, bleeding, crusting, or unlike the person’s other moles.

A dermatologist may use a dermatoscope to inspect structures that are not obvious to the naked eye. If melanoma remains possible, removing the lesion or taking a suitable sample allows a pathologist to examine the cells and helps guide staging.

Book a dermatology assessment for a changing blue or dark mark, and bring older photographs if available. Do not scrape, burn, or apply unprescribed creams to it. If melanoma is diagnosed, care may include surgical excision and, depending on findings, sentinel lymph node assessment, follow-up surveillance, or medicines such as immunotherapy. The plan depends on the pathology and stage.

Seek prompt review for a lesion that changes quickly, bleeds without clear injury, develops a persistent crust, becomes painful, or forms a new firm lump nearby. New neurological symptoms in someone already treated for melanoma, such as severe headache, weakness, confusion, or seizures, need urgent medical attention.

Ask whether the lesion needs dermoscopy, excision, or biopsy; what the pathology report will assess; and whether lymph-node evaluation or imaging is appropriate. Ask how often the treated area and surrounding skin should be checked.