Hutchinson lentigo or lentigo maligna describes a large area of dark pigmentation found on the face and neck of older patients. It is a well-defined, though irregular macular lesion with a brown or mottled black colour.
It is important because it is premalignant. Not only are the lesions so deeply pigmented that signs of malignant change are difficult to detect, but furthermore proliferating melanocytes are vacuolated and dysplastic. It is therefore perhaps not surprising that these lesions may becoming rapidly invasive - lentigo maligna melanoma.
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