Lentigo maligna
Lentigo maligna is where melanocyte cells have become malignant and grow continuously along the stratum basale of the skin , but have not invaded below the epidermis . 
<triplet> melanocyte <subj> stratum basale <obj> part of <subj> epidermis <obj> part of <triplet> stratum basale <subj> epidermis <obj> part of <triplet> epidermis <subj> stratum basale <obj> has part