Dermoscopic features of eyelid margin tumors: A single-center retrospective study.

Despite rapid growth in the significance of dermoscopy in dermatological oncology, relatively little is yet known about the dermoscopic patterns of eyelid margin tumors. The aim of the study was to analyze the dermoscopic features of eyelid margin tumors. This was a retrospective, single-center, consecutive study which included clinical and dermoscopic analysis of eyelid margin tumors diagnosed at the Department of Dermatology, Venereology and Allergology at the Medical University of Gdańsk from 1 June 2016 to 31 December 2020. Dermoscopic features significantly more prevalent in malignant non-melanocytic lesions compared to benign ones were alteration in eyelash growth, structureless pink areas, starry milia-like cysts, and perpendicular vessels. In contrast, there were no dermoscopic features that occurred significantly more frequently in malignant melanocytic lesions when compared to benign ones. Basal cell carcinoma, in comparison to hidrocystoma, more commonly presented with ulceration and structureless pink areas. The main features differentiating basal cell carcinoma from dermal nevus were the presence of ulceration, alteration in eyelash growth, structureless pink and structureless white areas, and perpendicular vessels within the tumor with each of these features observed more commonly in basal cell carcinoma. Blue nevus, hemangioma, or pigmented hidrocystoma presenting exclusively with blue structureless areas may be difficult to differentiate based on dermoscopy. The study offers additional dermoscopic clues in the assessment of eyelid margin tumors. Some observations reported previously to be typical of basal cell carcinoma (e.g., linear vessels arranged perpendicularly to the eyelid margin) were documented also within the normal eyelid margin accompanying other cases, and according to our study, cannot be useful as a pathognomonic feature. In contrast, it seems that yellow structures (half-moon sign, starry milia-like cysts) may be important dermoscopic features, though further studies are needed to confirm our observations.