The essential demand for lubrication of concentrated contacts is to maintain a full film separation to achieve low friction and protect surfaces against wear. The elastohydrodynamic lubrication mechanism is able to form a coherent film under severe conditions of point (line) contacts. However, any practical surface has some roughness. Generally, roughness tends to decrease film thickness and a direct asperity contact may locally occur. Nevertheless, the behavior of roughness is not simple since it influences a lubrication process, and simultaneously a lubricant significantly deforms roughness. It means that a two-sided interaction between lubricant and surface roughness takes place in concentrated contacts.