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An 11-year-old boy presented with slowly enlarging hyperpigmented patches on the lower back since the age of 5 years old. Family history was unremarkable. Further history revealed that he was constantly rubbing his back against the back of chairs since he was younger. On examination, he had a thin build, with three circular hyperpigmented brownish patches over the lower back in the midline above the …
Contributors ZXK is the main author and provided the initial draft of the manuscript. JHC and MJAK contributed the image and edited the article prior to submission.
Funding None declared.
Competing interests None declared.
Patient consent Parental/guardian consent obtained.
Provenance and peer review Not commissioned; internally peer reviewed.