What can cause both gastrointestinal issues and perforating skin disorder?

Inflammatory bowel disease such as ulcerative colitis or Crohn's disease can have various associated skin disorders. Crohn's can have fissures or fistulas. Inflammatory bowel disease is really an autoimmune disorder with extraintestinal complications. A gastroenterologist should be the specialist to take care of these patients but collaboration with rhematologists,dermatologists&Eye MDs is common