This is a pigmented BCC - these commonly have ‘tree-like’ arborizing telangiectasias, maple leaf-like pigmentation, blue-grey globules or ovoid nests, and ulceration.

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The presence of regression structures covering more than 10% of the lesion surface together with an atypical network is highly suspicious for melanoma.

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The presence of a broken-up black pigment network gives the ink-spot lentigo a typical and virtually diagnostic morphology.

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This is a superficial basal cell cardinoma. These commonly have areas of ulceration and sharply focused arborizing vessels.

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This is an acral melanocytic naevus showing a parallel-furrow pattern of pigmentation in which brown pigmentation is present in the furrows which are thinner than the non pigmented ridges.

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This is a reticulated seborrhoeic keratosis showing a reticular pigment network with sharp demarcation at the border. Comedo-like openings characteristic of this lesion are present.

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This is a classic pigmented BCC with clear blue-grey blotches. The presence of small ulcerations increases the diagnostic confidence. Note, two milia-like shiny cysts visible at the lower part of the lesion. These can sometimes be seen in BCCs.

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This is an invasive melanoma with a blue-white veil corresponding to the palpable part of the lesion. Areas of regression with an atypical pigment network of different shades of brown colour and thickness correspond to the flat part of the lesion.

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This is Bowen’s disease with clusters of closely packed dotted vessels and scaling.

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