  We present adaptive optics images of the extreme red supergiant VY Canis
Majoris in the Ks, L' and M bands (2.15 to 4.8 micron) made with LMIRCam on the
Large Binocular Telescope (LBT). The peculiar "Southwest Clump" previously
imaged from 1 to 2.2 micron appears prominently in all three filters. We find
its brightness is due almost entirely to scattering, with the contribution of
thermal emission limited to at most 25%. We model its brightness as optically
thick scattering from silicate dust grains using typical size distributions. We
find a lower limit mass for this single feature of 5E-03 Msun to 2.5E-02 Msun
depending on the assumed gas-to-dust ratio. The presence of the Clump as a
distinct feature with no apparent counterpart on the other side of the star is
suggestive of an ejection event from a localized region of the star and is
consistent with VY CMa's history of asymmetric high mass loss events.
