Urano-Suehisa S, Tagami H
Acta Derm Venereol. 1985;65(2):164-7.
The affected skin of pityriasis alba showed functional defects in both hygroscopicity and water-holding capacity detectable by water sorption-desorption test. Furthermore using skin surface biopsy technique in 5 patients, we noted that the mean area of corneocyte obtained from the affected skin of pityriasis alba was smaller and that the surface of that area showed a more prominent villous pattern than the adjacent normal skin in scanning electron microscopical observation. In this study we demonstrated the abnormalities of the horny layer in pityriasis alba, which suggest that the condition is similar to a dermatitic change and that its hypopigmentation may be due to postinflammatory mechanisms.
白色糠疹患者的受累皮肤在吸湿和解吸试验中显示出吸湿性和持水能力的功能缺陷。此外，我们对5例患者采用皮肤表面活检技术，发现在扫描电子显微镜观察下，白色糠疹受累皮肤角质形成细胞的平均面积较小，且该区域表面的绒毛状模式比相邻正常皮肤更为明显。在本研究中，我们证实了白色糠疹角质层的异常，这表明该病类似于皮炎性改变，其色素减退可能是由炎症后机制引起的。
