RESUMEN
Background: Sebaceous gland hyperplasia (SGH) is a benign cutaneous proliferation of the sebaceous glands that are mostly present on the face or the neck of older adults. They typically appear as single or multiple soft umbilicated papules; however, in challenging cases, it can be difficult to distinguish them from trichoepitheliomas, base cell carcinomas, or other tumors. Although pathological results have diagnostic value, the significance of non-invasive examinations in diagnosis and differential diagnosis is also worth exploring. Objectives: This study aimed to describe the dermoscopic and reflectance confocal microscopy (RCM) features of SGH. Methods: A total of 31 patients diagnosed with SGH, according to clinical and histopathological standards, were examined using dermoscopy and RCM between March 2018 and January 2022. Results: Dermoscopically, lesions revealed a yellowish-red background and a faint-yellow background in 25 (80.65%) and six cases (19.35%), respectively. White-yellowish lobulated structures in the center of the lesion were present in 31 patients (100%) and umbilications in 19 patients (61.29%). Crown vessels at the periphery of the lesions were observed in 11 patients (35.48%), whereas irregular linear vessels were observed on the surface of the lesions in 18 patients (58.06%). Under RCM, all lesions presented a honeycomb pattern in the epidermis and the typical morulae-shaped sebaceous lobules in the dermis. A dilated follicular infundibulum was observed in 15 patients (48.39%) and dilated vessels in 26 patients (83.87%). Conclusion: Dermoscopy and RCM enabled us to describe the imaging features of SGH. Combining these two useful tools provides a non-invasive basis for accurate clinical diagnosis.
RESUMEN
BACKGROUND: Superficial lymphatic malformation (SLM) is a congenital disorder of the lymphatic channels. It usually appears as clusters of vesicles filled with lymphatic fluid and blood on the skin that resemble frogspawn, making it difficult to distinguish from haemangiomas, angiokeratomas, and pyogenic granulomas. Although pathological results have diagnostic values, the significance of noninvasive examination in the diagnosis and differential diagnosis is also worth exploring. MATERIALS AND METHODS: A 24-year-old female presented with a history of multiple asymptomatic, pink lesions located on the chest since age 10. Histopathological examination was performed, and results informed the diagnosis of SLM. Lesions were detected by dermoscopy and reflectance confocal microscopy (RCM). RESULTS: Dermoscopy (polarized, 30×) revealed multiple yellowish-red lacunae in a light red background that were separated by pale septa and "hypopyon sign" was observed. RCM displayed a honeycomb pattern and multiple dark cavities in the upper dermal layers separated by thin septa with a few hypo-refractile cells at the periphery that demonstrated slow fluid flow via dynamic scanning. CONCLUSION: We described a case of SLM detected by dermoscopy and RCM. Dermoscopic and RCM features may provide a potentially powerful, noninvasive instrument for the recognition and differentiation of SLM.
