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Contributors MRY has done clinical examination and HRUS, conceptualised the paper, written the manuscript and taken consent from patients. LP and JM have edited the manuscript. VT has reported the skin biopsy. AP has taken the clinical photographs and edited the scan images.
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; internally peer reviewed.
Author note Consent: Taken from patients in accordance with COPE guidelines.
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