Lentigo maligna (LM) is relatively rare form of malignant melanoma (MM), corresponding to 4–15% of all MM cases [1].

How serious is lentigo maligna?

Lentigo maligna is not dangerous; it only becomes potentially life threatening if an invasive melanoma develops within it. Long term follow-up involves reviewing the treated area and full skin examination to identify new lesions of concern. If the lesion was invasive, regional lymph nodes should also be examined.

How common is lentigo?

Lentigo maligna melanoma is most often found on sun-exposed skin in the head and neck of middle-aged and elderly persons (see the image below), and is slightly more common in women. Approximately 10-30% of all cutaneous melanoma arise in this region.