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A 12-year-old boy with type 1 diabetes mellitus and coeliac disease reported 2–3 months of skin darkening at his insulin pump cannula and continuous glucose monitor sites (figure 1). For the preceding 9 months, he had localised itching and redness, which had been managed as allergic contact dermatitis by a dermatologist. He continued to use the dressings and these symptoms had improved. Hyperpigmentation was noted over his knuckles and periorally. He had no symptoms of adrenal insufficiency and …
Contributors RJM, ACR and JHD were all involved in the clinical care of this patient. RJM wrote the initial draft of the manuscript. RJM, ACR and JHD contributed to editing of the manuscript and all approved the final submitted version.
Funding RJM is funded by Health Education England (HEE)/NIHR as an academic clinical lecturer.
Competing interests None declared.
Provenance and peer review Not commissioned; externally peer reviewed.