A previously healthy 9-year-old boy presented to dermatology outpatient clinic with a 2-month history of an enlarging nodule on the anterior right shoulder (figure 1). There were no specific symptoms, family history or relevant medical history. Examination demonstrated a 1×1 cm indurated yellow nodule with ulceration. Differential diagnoses included giant molluscum, giant juvenile xanthogranuloma (JXG) and keratoacanthoma. Histology from an incisional biopsy demonstrated surface excoriation and focal erosion with underlying dense monomorphous histiocytic population with …