  The coexistence of superconducting and charge-density-wave order in the
half-filled attractive Hubbard model is interpreted as a consequence of the
pseudospin SU(2) symmetry spontaneously broken to a `hidden' subgroup U(1). By
topological arguments we show that there must exist new skyrmion textures
associated with this symmetry breakdown. This fact is illustrated via a
non-linear $\sigma$-model. Unlike the spin textures previously known in an
antiferromagnetic background, doping the model away from half-filling leads the
new skyrmions to unwrap.
