期刊
JOURNAL OF DERMATOLOGY
卷 50, 期 3, 页码 393-396出版社
WILEY
DOI: 10.1111/1346-8138.16627
关键词
hyperknesis; itch; itch sensitization; postherpetic itch; small fiber neuropathy; touch-evoked itch
类别
This study reported five patients with postherpetic itch, showing increased touch-evoked itch in the affected skin areas. Skin biopsy specimens from two patients revealed reduced intraepidermal nerve fibers in the affected skin areas. In one case, improvement in itching and comparable levels of touch-evoked itch were observed after 6 months without medication, along with restored intraepidermal nerve fibers confirmed through rebiopsy. Reduced intraepidermal nerve fibers may contribute to postherpetic itch and its associated punctate hyperknesis.
Chronic itch conditions are often accompanied by neural itch sensitization, known as hyperknesis (excessive itch induced by stimuli that would normally induce only mild itching or pain) and alloknesis (considerable itch evoked by light tactile stimuli). Herpes zoster (shingles) can cause neuropathic itch (postherpetic itch), although it is unknown whether hyperknesis accompanies postherpetic itch. The authors report five patients with postherpetic itch who showed increased touch-evoked itch (punctate hyperknesis) in the affected skin areas compared with the contralateral site. Collected skin biopsy specimens from two patients showed histopathologically detected reduced intraepidermal nerve fibers in the affected skin areas, reflective of small C/A delta fiber neuropathy. In one case, improvement in itching and comparable levels of touch-evoked itch on the affected and contralateral sites were noted after 6 months without any medication, accompanied by restored intraepidermal nerve fibers proven through rebiopsy of the affected site. Reduced intraepidermal nerve fibers could be one of the precipitating factors for postherpetic itch and its associated punctate hyperknesis.
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