Amy,
Mast cell tumors are common in ferrets.  These tumors are found on the skin
as raised areas that can cause hair loss and pruritis (itchy skin).  These
tumors are not as aggressive as mast cell tumors of dogs and cats can be.
 Removal of the tumor is usually curative.
There has been reports of mast cell tumors found concurrently with
insulinomas of the pancreas.  Although this colud be coincidence I would
recommend pre-op bloodwork to check the glucose level.
Dr. Weiss
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[Posted in FML issue 1086]