Dark matter does not readily "accumulate". If(?) it exists then it interacts very weakly with normal matter and is primarily influenced by gravity. The Earth's gravity is far too small to make a local concentration of dark matter. The local dark matter would be moving in the Galactic potential at speeds similar to that of the Sun around the Galaxy ($\sim 250$ km/s); this is too fast to be gravitationally captured by the Earth and the cross-section to inelastic interaction by any other means is thought to be too small (this is why it is called dark matter - there are no electromagnetic interactions) to catch dark the matter. The same may not be true for the Sun, which offers a deeper gravitational potential and a "thicker" target (e.g. Vincent et al. 2015).
In fact there is little dark matter in the local disk plane of our Galaxy at all. It is estimated that the local dark matter density is around $\sim 0.01$ $M_{\odot}$/pc$^3$ (Garbari et al. 2012, Bovy & Tremaine 2012) corresponding to only a few $10^{-22}$ kg/m$^3$. For comparison, the density of the interplanetary medium is abut 100 times greater.