Fig. 2. Observed histologic features of skin tissue of the erythematous lesion with alopecia include multiple, well-circumscribed, nodular aggregations of epithelioid histiocytes and surrounding mild lymphocytic cells infiltrating the dermis, and a few multinucleated giant cells of the Langhans type (H&E stain; original magnification ×100 [A] and ×200 [B], respectively).