Question: Can you identify this condition?

A 7-year-old boy presented with an asymptomatic, slightly hypopigmented patch over his left abdominal area. The patch appeared shortly after birth and has been relatively stable in size, texture, and shape ever since. Skin examination revealed a unilateral, irregular, hypopigmented macule over the left abdomen, with normal surrounding skin. Rubbing the lesion induced erythema. No other areas were affected. Wood lamp examination revealed an off-white accentuation without fluorescence. The boy was otherwise healthy and did not have a family history of a similar condition.

• Copyright© the College of Family Physicians of Canada