  An spectrum of an electron (quark) with ultrasoft momentum (p g^2T) is
discussed at extremely high temperature in quantum electrodynamics
(chromodynamics) with a resummed perturbation theory. We establish the
existence of the pole suggested in the previous work of the electron (quark)
propagator at ultrasoft region, and find that its pole position is p_0=\mp
|p|/3-i\zeta, where \zeta is the damping rate which is of order g^2T ln 1/g,
and the expression of its residue. We also discuss whether the resummation
scheme preserves the gauge symmetry.
