Azathioprine-induced Sweet's syndrome: A case series and review of the literature.

We present three patients with azathioprine-induced Sweet's syndrome (AISS) who attended our tertiary institution within a 12-month period. Established associations exist between Sweet's syndrome and some medications; however, to date links to azathioprine are tentative. While there are case reports of AISS, most have occurred in patients with inflammatory bowel disease (IBD), an underlying predisposition for Sweet's syndrome.