Early on this is fairly common, but it also depends on whether or not sub mental liposuction was done. Consult with your surgeon if you do not see improvement within a few months.
There are two categories of "lumps" after a facelift. Early lumps are quite common and should not illicit concern unless grossly asymmetrical. Most of these lumps are likely to resolve. Late lumps, which are lumps more than 3-6 months after the procedure, may signify concern. This may consist of the use of deep permanent sutures, early granuloma formation, abnormal scarring, inconsistent liposuction.