It's great that you are having monthly monitoring.
As for the flap, I was told, no, it wouldn't recur there. However, my recent cancer, although quite small, managed to extend a wee bit onto the flap under my tongue. I felt nothing on the flap but there was soreness in the base lesion.
My original flap (still have most of it) changed all the time over the four years . It grew more and more like mucous membrane tissue ... almost sounds as if there's a nerve in yours.
Best wishes for your check up:)


1996, ovarian cancer surgery + cisplatin and taxol.
September, 2007, SCC of left lateral tongue. Excision.
October, 2009 recurrence in scar tissue, T1NOMO. Free flap surgery from left wrist - neck dissection. 63 year old New Zealander. No chemo, no RT.
February, 2014. New primary in left buccal mucosa. Marginal mandibulectomy, neck dissection, right arm free forearm flap. T1N0M0 but third occurrence and some areas of concern: RT started 8 April and finished 19 May.