MSFinals-4626
A 6-month-old Caucasian baby girl is brought to her general practitioner, as her parents are concerned about a skin lump that has appeared on the left side of her neck. It is non-tender and does not seem to bother her, but it is growing in size. She is feeding well and is otherwise healthy. On examination, there is a 2 x 2 cm, firm and well-demarcated lesion in the left posterior triangle of the neck, with visible telangiectasia. There are no other skin lesions. The abdomen is soft, without masses.
What would be the next step in management?