Dermoscopic follow-up of cutaneous rosai-dorfman: Spontaneous regression

Cutaneous rosai-dorfman(CRDD) is a rare non-langerhans cell histiocytosis with unknown origin. Studies reporting the dermoscopic features of CRDD are limited. We report a case of a 62-year-old Asian woman with 1-month history of a solitary reddish nodule on her left nose wing which was histolocically diagnosed as CRDD. The lesion underwent spontaneous remission without any intervention.Dermoscopy was utilized for follow-up observation. The dermoscopic features of the CRDD lesion included red-brownish and red-orange background, yellowish follicular keratotic plugs, whitish opaque cotton structures and linear- irregular vessels. These features gradully faded away along with the remission of the lesion. We describe the dynamic dermoscopic changes of the remission process of CRDD. Dermoscopy is potentially useful in the assessment and follow-up of CRDD patients.