Lentigo maligna melanoma (melanoma on chronically sun-damaged skin of the head, neck)

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Main PageMELANOMALentigo maligna melanoma (melanoma on chronically sun-damaged skin of the head, neck)
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 Author(s): Lauren Fried
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Below are dermoscopic features commonly associated with the diagnosis “Lentigo maligna melanoma (melanoma on chronically sun-damaged skin of the head/neck)”.[1] The example images have been approved by a panel of experts as representative of each given feature.

For a more in-depth discussion of associated features, please see the Dermoscopedia pages for “Lentigo maligna” and "Melanoma on sun damaged skin".

Annular-granular pattern (gray dots around follicular openings)[edit]

a) Dots aggregated around adnexal openings and/or b) short and polygonal lines around and between adnexal openings.[2]

Asymmetric pigmentation around follicular openings[edit]

Crescent-shaped pigmentation that accentuates in only one portion of the follicular opening.[3]

Rhomboidal structures (angulated lines)[edit]

Angulated lines: short, pigmented lines around and between adnexal openings.[4]

Rhomboidal structures: Elongation, thickening, and merging of the short polygonal lines around adnexal openings form a polyhedral-shaped structures.[5]

Circle within a circle (isobar)[edit]

Dark blotches with or without obliterated hair follicles[edit]