1. Pyoderma gangrenosum in the head and neck;Wittekindt;Arch Otolaryngol Head Neck Surg,2007
2. Pustular pyoderma gangrenosum: an uncommon variant which is easily misdiagnosed;Chia;Dermatol Online J,2008
3. Diagnostic criteria of ulcerative pyoderma gangrenosum: a Delphi consensus of international experts;Maverakis;JAMA Dermatol,2018
4. A case of pyoderma gangrenosum;Miller;The Medicine Forum,2012