  I address uncertainties on the spatial distribution and mass of the dust
formed in $\eta$ Carinae's Homunculus nebula with data being combined from
several space- and ground-based facilities spanning near-infrared to sub-mm
wavelengths, in terms of observational constraints and modeling. Until these
aspects are better understood, the mass loss history and mechanisms responsible
for $\eta$ Car's enormous eruption(s) remain poorly constrained.
