  We study the cosmic microwave background (CMB) anisotropy due to spherically
symmetric nonlinear structures in flat universes with dust and a cosmological
constant. By modeling a time-evolving spherical compensated void/lump by
Lemaitre-Tolman-Bondi spacetimes, we numerically solve the null geodesic
equations with the Einstein equations. We find that a nonlinear void redshifts
the CMB photons that pass through it regardless of the distance to it. In
contrast, a nonlinear lump blueshifts (or redshifts) the CMB photons if it is
located near (or sufficiently far from) us. The present analysis
comprehensively covers previous works based on a thin-shell approximation and a
linear/second order perturbation method and the effects of shell thickness and
full nonlinearity. Our results indicate that, if quasi-linear and large
($>100$Mpc) voids/lumps would exist, they could be observed as cold or hot
spots with temperature variance $>10^{-5}$K in the CMB sky.
