  We reexamine the quark mass induced term in chiral Lagrangian in color-flavor
locking phase in dense QCD, and show that the meson mass term is determined by
three independent invariants under chiral-axial symmetry, and a meson mass is
given in terms of the quark mass, gap, and the chemical potential by
$m_{\pi}^2\sim m_q^2\Delta\bar{\Delta}/\mu^2\ln(\mu^2/\Delta^2)$. Thus mesons
become massless as $\mu\to\infty$.
