It is known that hydrophobic molecules of lesser weight transit from the stratum corneum layer easily.
There is not certain findings related to transition to lower layer of epidermis and dermis. In addition to this, it is reported that the molecules heavier than 500 Da cannot transit from stratum corneum layer.
Based on the information, silica (which has a high water extraction feature) has no skin permeability. This is because its ionic structure is different than that of the skin.
Therefore, silica will not be absorbed to the intradermal space, but the water retention properties allows silica to remove the extrafluid from the derma.