  We consider the effect of disorder on the spectrum of quasiparticles in the
point-node and nodal-line superconductors. Due to the anisotropic dispersion of
quasiparticles disorder scattering may render the Hamiltonian describing these
excitations non-Hermitian. Depending on the dimensionality of the system, we
show that the nodes in the spectrum are replaced by Fermi arcs or Fermi areas
bounded by exceptional points or exceptional lines, respectively. These
features are illustrated by first considering a model of a proximity-induced
superconductor in an anisotropic two-dimensional (2D) Dirac semimetal, where a
Fermi arc in the gap bounded by exceptional points can be realized. We next
show that the interplay between disorder and supercurrents can give rise to a
2D Fermi surface bounded by exceptional lines in three-dimensional (3D) nodal
superconductors.
