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A 45-day-old male infant was brought to the outpatient department with dark discolouration of the dorsum of the tongue that had developed the day before (figure 1).
He was born after 38 weeks’ gestation (complicated by pre-eclampsia) to young healthy non-consanguineous parents. His birth weight was 3350 g …
Funding None declared.
Competing interests None declared.
Patient consent Obtained from the parents/guardian.
Provenance and peer review Not commissioned; externally peer reviewed.