Footnotes

• Contributors LS, AN, BH and DMT were part of the clinical team responsible for the patient’s care during the reported presentation and conceived and planned the report. LS, AN and BH collated the investigation results and arranged photography. LS and AN wrote the first draft of the report; all authors contributed to further versions of the manuscript.

• Funding The authors have not declared a specific grant for this research from any funding agency in the public, commercial or not-for-profit sectors.

• Competing interests None declared.

• Patient consent for publication Obtained.

• Provenance and peer review Not commissioned; externally peer reviewed.