Syneresis, “the contracting of a gel accompanied by the separating out of a liquid.” Something like yogurt does this, where it seems to be one homogeneous gel, then something starts to leak out a bit. This can occur with gels when the solubility of the liquid in the gel exceeds the limits when temperature changes. It can occur with lotions and anhydrous products when you see that separation of the oils oozing out of a balm or emulsion.