A 1-year-old boy presents with a solitary lesion on his right thigh. It first appeared when he was 1 month of age and it has persisted since that time. The lesion is usually asymptomatic, but becomes swollen and itchy when rubbed or traumatized. Skin examination reveals a soft erythematous to brownish papule, 1 cm in length, on the lateral aspect of the upper right thigh. The patient is otherwise healthy and does not have a family history of a similar condition.
The most likely diagnosis is
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Congenital melanocytic nevus
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Solitary mastocytoma
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Insect bite
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Epidermal cyst
Answer on page 770
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