This could be a sign of a type of skin cancer called lentigo maligna melanoma (it represents from 5 to 15 percent of melanoma cases).    From Wordnik.com.  [Out, Out Damn Spots] Reference

lentigo maligna is referred to as such until it becomes invasive, penetrating the deeper layers of skin and making its way to other parts of the body, it then gains the name of lentigo maligna melanoma.    From Wordnik.com.  [CreationWiki - Recent changes [en]] Reference

lentigo maligna is referred to as such until it becomes invasive, penetrating the deeper layers of skin and making its way to other parts of the body, it then gains the name of lentigo maligna melanoma (LMM).    From Wordnik.com.  [CreationWiki - Recent changes [en]] Reference

There are four basic types of melanoma: superficial spreading melanoma, lentigo maligna, acral lentiginous melanoma, and nodular melanoma; the first three types are found in the uppermost layer of skin, the epidermis, and are noninvasive.    From Wordnik.com.  [CreationWiki - Recent changes [en]] Reference

There are four basic types of melanoma: superficial spreading melanoma, lentigo maligna, acral lentiginous melanoma, and nodular melanoma; the first three types are found in the uppermost layer of skin, the epidermis, and are non invasive.    From Wordnik.com.  [CreationWiki - Recent changes [en]] Reference

#What is the pathology of lentigo?.    From Wordnik.com.  [Essentials of Diseases of the Skin Including the Syphilodermata Arranged in the Form of Questions and Answers Prepared Especially for Students of Medicine] Reference