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Shingles is an acute, unilateral, self-limiting inflammatory disease of cerebral ganglia and the ganglia of posterior nerve roots and peripheral nerves in a segmented distribution, caused by Varicella Zoster virus (VZV) - the chicken pox virus. It is characterised by small vesicles in the cutaneous areas along the course of affected nerves.
This can be thought of as a reactivation of varicella that has remained latent
in the sensory dorsal root ganglion.
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here for example images of this condition
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