CONGENITAL NEVUS CONTAINING A CLUSTER OF BALLOON CELLS 
This is actually a 'recurrent' nevus in that there are scar and lentiginous melanocytic hyperplasia overlying the remains of the original nevus.
 
 
Scan showing a cluster of balloon cells beneath the scar plus ordinary nevus cells (onc).
Low power of  balloon cells and ordinary nevus cells (onc).
High power view of balloon cells.

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