We present sub-arcsec angular resolution , high-Strehl ratio mid-IR adaptive optics images of the powerful OH/IR source and cool hypergiant NML Cyg at 8.8 , 9.8 and 11.7 \mu m. These images reveal once more the complexity in the dusty envelope surrounding this star . We spatially resolve the physical structures ( radius \sim 0.″14 , \sim 240 AU adopting a distance of 1.74 kpc ) responsible for NML Cyg ’ s deep 10 \mu m silicate dust absorption feature . We also detect an asymmetric excess , at separations of \sim 0.″3 to 0.″5 ( \sim 520 to 870 AU ) , NW from the star . The colors of this excess are consistent with thermal emission of hot , optically thin dust . This excess is oriented in the direction of the Cyg OB2 stellar association , and is likely due to the disruption of NML Cyg ’ s dusty wind with the near-UV radiation flux from the massive hot stars within Cyg OB2 . This interaction was predicted in our previous paper Schuster et al . ( 50 ) , to explain the geometry of an inverted photo-dissociation region observed at optical wavelengths .