A 16-month-old boy is presented to the dermatology clinic with a gradual accumulation of ‘brown spots’ on his skin. These lesions were not present at birth and the majority appeared as a crop over a 4-month period around his first birthday. She feels it is possible that he will continue to acquire new lesions. He had one on his right forearm, which has resolved. She has noticed that some of the lesions appear to ‘blister’ or become raised after a bath. He is otherwise well; he is thriving and enjoys a full diet.
He has no gastrointestinal symptoms or wheeze. There is no family history of similar skin lesions. The rest of the family is entirely well. Examination His height and weight are on the 75th and 91st centiles for his age, respectively. He is cooperative and follows directions. He has diffused, scattered, monomorphic, small oval-round reddish-brown macules concentrated…
