Circles

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View this YouTube video of Circles in Dermoscopy

View this presentation by Cliff Rosendahl on Grey Circles

Pseudopods

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Clods

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Dots

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Polygons

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Structureless

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Vessels

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Look at vessels last in deciding on the nature of a lesion. They are the least reliable feature to use. Identify the predominant vessel type and check with the table below. Serpentine and linear branching of BCC are fairly reliable as is the polymorphous pattern with dot vessels for an amelanotic melanoma. The sheet of coiled vessels found in SCC in situ is also a good marker.