The lesions shown were located on the forearm of a 47-year-old man (Figure 1A), the forearm of a 51-year-old man (Figure 1B), and the trunk of a 55-year-old woman (Figure 1C), all of them presenting with a lichenoid rash. Dermoscopy revealed 2 differential patterns in these lesions: (1) reticular, white Wickham striae (WS) (Figure 2A) in the papules shown in Figure 1A and (2) round to oval, yellow-brown, homogeneous patches (YPs) (Figure 2B and C) and absence of WS in the lesions shown in Figure 1B and C. A histopathologic diagnosis of lichen planus (LP) was made in 1 patient (Figure 1A, inset), and lichenoid sarcoidosis was diagnosed in the other 2 patients (Figure 1B and C, insets).
Vazquez-Lopez F, Palacios-Garcia L, Gomez-Diez S, Argenziano G. Dermoscopy for Discriminating Between Lichenoid Sarcoidosis and Lichen Planus. Arch Dermatol. 2011;147(9):1130. doi:10.1001/archdermatol.2011.278