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A 8-month-old boy presented with a painful skin lesion on the sole of the right foot, near the base of the fifth toe. His parents reported that the lesion first appeared at birth as a small brownish discolouration and evolved rapidly over several months into a conical shape, blackish colour and a hyperkeratotic surface (figure 1).
Competing interests None.
Patient consent Obtained.
Provenance and peer review Not commissioned; internally peer reviewed.
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