  We discuss distortion in microlensing-induced light curves which are
considered to be curves due to single-point-mass lenses at a first glance. As
factors of the distortion, we consider close binary and planetary systems,
which are the limiting cases of two-point-mass lenses, and the gravitational
potential is regarded as the sum of the single point mass and the corrections.
In order to quantitatively estimate the asymmetric features of such distorted
light curves, we propose a cutoff dependent skewness, and show how to
discriminate the similar light curves with it. We also examine as the
distortion the general relativistic effect of frame dragging, but the effect
coincides with the close binary case in the light curves.
