The etiologies included neurodermatitis, pruritus caused by postherpetic neuralgia, nostalgia paresthetica, anesthesia dolorosa, nasal pruritus, and diabetic neuropathy (J Am Acad Dermatol.
In addition, some patients find the numbness very uncomfortable--this is called painful numbness or anesthesia dolorosa. Other side effects include temporary weakness of the masseter muscle on that side of the face and temporary ear fullness as a result of fluid in the eustachian tube (Kanpolat, Savas, Bekar, & Berk, 2001; Latchaw, Hardy, Forsythe, & Cook, 1983).
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