Pyoderma gangrenosum confused with congenital preauricular fistula infection: A case report

Figure 1 Physical examination of the left face.

Figure 2 Axial CT scan. Skin and subdermal soft-tissue defect without obvious erosion into the facial muscle, parotid gland and external auditory canal; high-density material lateral to zygomatic arch is iodoform gauze.

Figure 3 Biopsy specimen: widespread infiltration of inflammatory cells.

Figure 4 Appearance of auricular area after 6 mo. The preauricular sinus is still visible.