Limtong Preeyachat, Suchonwanit Poonkiat
Division of Dermatology, Department of Medicine, Faculty of Medicine, Ramathibodi Hospital, Mahidol University, Bangkok, Thailand.
Clin Cosmet Investig Dermatol. 2021 Nov 23;14:1767-1772. doi: 10.2147/CCID.S343365. eCollection 2021.
Circle hair is a rare body-hair disorder of unknown etiology, typically characterized by perfectly or nearly perfectly coiled hair located below the cornified layer of the skin. Its main histopathological features are dilated hair-follicle infundibula and entrapped hair shafts. After its first description in 1963, there have only been a small number of reported cases, and its pathophysiology remains unclear. Herein, we report a case of an 80-year-old woman with skin lesions and abnormal hairs on both legs. We also propose a possible mechanism of her circle hairs: it may have occurred as an effect of her acquired ichthyosis secondary to her underlying multiple myeloma. There is no specific treatment for circle hairs, and reassurance that it is a harmless condition is sufficient. We prescribed a topical humectant and keratolytic agent to moisten the skin and lessen the hair entrapment, which resulted in clinical improvement. As the pathogenesis of the disease is unknown, further studies are warranted.
环形毛发是一种病因不明的罕见体毛疾病，其典型特征是位于皮肤角质层下方的毛发完美或近乎完美地盘绕。其主要组织病理学特征是毛囊漏斗扩张和毛发干被困。自1963年首次描述以来，仅有少数病例报道，其病理生理学仍不清楚。在此，我们报告一例80岁女性双下肢皮肤病变和毛发异常的病例。我们还提出了她环形毛发的一种可能机制：可能是由于其潜在的多发性骨髓瘤继发获得性鱼鳞病所致。环形毛发没有特效治疗方法，告知患者这是一种无害状况就足够了。我们开了一种外用保湿剂和角质溶解剂来滋润皮肤并减少毛发被困，临床症状得到改善。由于该疾病的发病机制尚不清楚，有必要进一步研究。
