Medical Must-See: Identical scalp lesions in three siblings a real head-scratcher

The pseudo-alopecic plaques had a 'dirty' appearance with 'honey-like crusts', doctors reported.

The rule of three rang true for a trio of unlucky siblings in Mexico when doctors found a rare fungal source for their near-identical head lesions.

A concerned father brought in the three children — two boys and a girl, aged between four and six — who presented with pruritic lesions, or kerions, on their scalps that were 3cm in diameter and had been present for at least a month.