  We develop a model to investigate analytically and numerically the mechanics
of wound opening made in a viscoelastic, isotropic, homogeneous, and
incompressive thin tissue. This process occurs just immediately after the wound
infliction. Before any active biological action has taken place, the tissue
relaxes, and the wound opens mostly due to the initial homeostatic tension of
the tissue, its elastic and viscous properties, and the existing friction
between the tissue and its substrate. We find that for a circular wound the
regimes of deformation are defined by a single adimensional parameter
$\lambda$, which characterizes the relative importance of viscosity over
friction.
