PMC4772639_01
Clinical presentation: a 6-cm, well-demarcated plaque with a dusky center, erythematous border and central collapsed bulla.
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F1
On physical examination, there was a 6-cm well-circumscribed annular plaque with a dusky center, a central collapsed bulla and an erythematous border on her left lateral thigh a 6 cm (fig. 1).
Histological examination: keratinocyte necrosis and diffuse lymphocytic inflammatory infiltrate.
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F2
Histopathology demonstrated numerous keratinocyte necroses along with a lymphocytic perivascular infiltrate (fig. 2), consistent with the clinical diagnosis of a FDE.