label: Lentigo maligna melanoma
label_lc: lentigo maligna melanoma
description: A subtype of melanoma in situ that typically develops on sun-damaged skin. The lesion is typically a large, irregularly pigmented macule that has developed from an ordinary lentigo (a small pigmented spot on the skin with a clearly-defined edge). Change to a malignant lentigo typically takes place over 20 years or more, and many patients accept the change as a consequence of aging.