Unilateral beard

This is a Becker’s naevus on the left chin of a man in his 20s (fig 1).bmj;378/sep21_4/e072232/F1F1f1Fig 1The patient reported that a light tan patch had been present on the left side of his chin since childhood. The lesion was not associated with symptoms. When the patient’s facial hair developed during puberty, he noticed it was thicker in the area of the patch and required more frequent trimming.On examination, a well circumscribed hyperpigmented patch with hypertrichosis was noted in the left submandibular region and left side of the neck, overlapping with the beard area. No facial asymmetry was evident. Becker’s naevus was diagnosed.Becker’s naevus is a cutaneous hamartoma, characterised by localised, unilateral patchy brown hyperpigmentation with a well demarcated geographical border.1 Occasionally, as in this patient, hypertrichosis is also present. Becker’s naevus is an androgen dependent lesion that occurs mostly in men, although boys can also be affected. Although it…
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