Behcet's disease

noun

Beh·​cet's disease ˈbā-səts- 

variants or Behcet's syndrome also Behçet's disease or Behçet's syndrome

: a rare disease of unknown cause that is marked by chronic inflammation of blood vessels with symptoms including ulcerative sores especially of the mouth and genitals, inflammation of the eye, and joint swelling and pain

… has struggled with what was diagnosed as Behcet's disease, a form of vasculitis, which causes lesions, mouth blisters and joint pain.

—Brad Townsend, The Dallas Morning News