Fig. 2

Macroscopic and microscopic features of suspicious melanocytic lesions in the acral area. A Macroscopic appearance of a melanocytic lesion in the acral region. B Perpendicular macroscopic section through the surface lines of acral skin showing diffuse pigmentation of the epidermal surface ridges. C Histological feature (H&E) of acral skin, with a malignant melanocytic proliferation in the intermediate ridges and corresponding clinical appearance of suspected malignancy with pigmented ridges