Only if the itch is localized, mainly unilateral like in notalgia paresthetica of the back or the forearm.

I agree with Dr. @Aida Lugo-Somolinos and will add that there is also a higher yield of spinal imaging in chronic anogenital pruritus. I personally find imaging quite unsatisfying because regardless of what you find the treatment algorithm is basically the same. However, theoretically as a last-line...