  We investigate the pattern of anomalies in the light curves of
caustic-crossing binary microlensing events induced by spot(s) on the lensed
source star. For this purpose, we perform simulations of events with various
models of spots. From these simulations, we find that the spot-induced
anomalies take various forms depending on the physical state of spots, which is
characterized by the surface brightness contrast, the size, the number, the
umbra/penumbra structure, the shape, and the orientation with respect to the
sweeping caustic. We also examine the feasibility of distinguishing the two
possibly degenerate types of anomalies caused by a spot and a transiting planet
and find that the degeneracy in many cases can be broken from the
characteristic multiple deviation feature in the spot-induced anomaly pattern
caused by the multiplicity of spots.
