Abstract
Solar lentigines are sharply circumscribed, uniformly pigmented macules that are located predominantly on the sun-exposed areas of the skin, such as the dorsal aspects of the hands, the shoulders, and the scalp. A solar lentigo is a benign lesion that can evolve to form a pigmented seborrheic keratosis. Lichen planus–like keratosis (LPLK) is a relatively common skin lesion found on actinically damaged skin. Clinically, LPLK usually occurs as a solitary lesion with sharply demarcated borders. It may be macular or slightly raised and has brown, tan-brown, violaceous, or red-brown color. There is also a pink variant of LPLK that resembles a basal cell carcinoma. The coarse granules in LPLK can be confused with the multiple blue-gray dots seen in melanomas. One differentiating feature, however, is the size of the granules. In LPLK, the granules tend to be larger, coarser, and often appear clumped. In contrast, in melanoma, the blue-gray dots are much smaller and finer in size.
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