Footnotes

• RK and AK are joint first authors.

• Twitter @akapil15

• Contributors RK and SS: worked up the case, took the photographs and wrote the manuscript. AK and VG: involved in clinical management and final review of 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.

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