Urticaria Pigmentosa

An otherwise healthy 4-month-old boy presented with persistent pruritic skin eruptions that had been present since the first week of life. His mother reported that the lesions repeatedly swelled up following oil massages. Cutaneous examination revealed multiple discrete tan-brown waxy papules and nodules ranging from 5 to 15┬ámm in diameter, involving the trunk (Figure, A). His face, acral areas,…