Folgoration as an Example of Pathergy in a Patient Affected  by Pyoderma Gangrenosum  and Takayasu's Arteritis

<table>Pustules gradually involving in esulcerative lesions, characterized  by a progressive external expansion, unruffled limits and violaceus borders.</table>

Dermatology Research and Practice

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Figure 2

Figure 2: Folgoration as an Example of Pathergy in a Patient Affected  by Pyoderma Gangrenosum  and Takayasu's Arteritis 