ABSTRACT
Non-pigmented seborrheic keratoses (SK) display regularly distributed hairpin vessels, surrounded by a white halo. SKs are common benign epithelial lesions that typically present as rough, well-demarcated, and skin colored to brown to black papules or plaques in adult patients. Dermoscopically, non-pigmented SKs may be recognized by a number of features, including a well-demarcated edge, comedo-like openings, multiple milia cysts, a cerebriform appearance with gyri and sulci, and hairpin vessels. Lichenoid keratosis is a variant of SKs that may present as a smooth or scaly pinkish macule, plaque, or papule. It may also be pruritic. Large cell acanthoma may simulate Clear cell acanthoma (CCA) in revealing dotted and/or coiled vessels in a stringlike arrangement. The identification of CCA is enhanced by dermoscopy, which reveals a striking pattern of dotted and/or coiled vessels arranged in a linear, stringlike distribution.
