Pigmented hidroacanthoma simplex: A diagnostic pitfall

Figure 1 Histopathological findings of the right lower leg tumor (HE stain). A: Intraepidermal proliferation (so-called “Jadassohn phenomenon”) of small-sized basaloid cells (original magnification, × 40); B: The nuclei of the basaloid cells are smaller than those of neighboring epidermal keratinocytes and dendritic melanocytes are scattered within the tumor nests (original magnification, × 200); C: Within the tumor nests, a few ductal structures are observed (arrow) (original magnification, × 600).