Behcet's disease or Behcet's syndrome is a rare autoimmune disease that causes blood vessels throughout the body to become inflamed, causing mouth sores, rashes, and other symptoms. Symptoms may temporarily improve, but then return.

Behcet's disease is a rare disorder characterized by inflammation of blood vessels throughout the body. The disease initially presents with a variety of signs and symptoms that are difficult to diagnose, including mouth ulcers, eye inflammation, skin rashes, and genital lesions and ulcers.