Vitiligo has a major impact on the QoL of family members of patients and often significantly impairs many aspects of their lives. Educational and supportive programs are recommended for family members of vitiligo patients who are at an increased risk for QoL impairments.
Scalp pruritus is a common complaint that is considered a diagnostically and therapeutically challenging situation. Scalp skin has a unique neural structure that contains densely innervated hair follicles and dermal vasculature. In spite of the recent advances in our understanding of itch pathophysiology, scalp itching has not been studied as yet. In this review, we summarize the current knowledge on the neurobiology of scalp and hair follicles as well as itch mediators and provide a putative mechanism for scalp itch with special emphasis on neuroanatomy and pathophysiology.
Background
Scratching an itch is perceived as being pleasurable. However, an analysis of topographical variations in itch intensity, the effectiveness of scratching to provide itch relief and the associated pleasurability has not been performed at different body sites.
Objective
To examine the role of scratching pleasurability in providing itch relief by investigating whether itch intensity is perceived differently at 3 different sites and to assess a potential correlation between the pleasurability and itch attenuation induced by scratching.
Methods
Itch was induced on the forearm, ankle and back using cowhage spicules in eighteen healthy subjects. These sites were subsequently scratched by an investigator with a cytology brush immediately following itch induction. The intensity of itch with and without scratching at these sites and the pleasurability of scratching were recorded by taking VAS ratings at 30 seconds intervals.
Results
Average itch intensity and scratching pleasurability ratings at the ankle and back were significantly higher than on the forearm. For the forearm and ankle, the higher the itch while scratching, the higher was the pleasurability. A higher baseline itch was linked to a higher itch reduction secondary to scratching in all tested areas. Pleasurability paralleled the curve of itch reduction for the back and forearm, however scratching pleasurability at the ankle remained elevated and only slightly decreased while itch was diminishing.
Conclusions
There are topographical differences in itch intensity, the effectiveness of scratching in relieving itch and the associated pleasurability. Experimental itch induced by cowhage was more intensely perceived at the ankle, while scratching attenuated itch most effectively on the back.
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