Hulusi Behçet was a Turkish dermatologist and researcher, best known for his discovery of Behçet's disease, a rare autoimmune condition. Born on February 20, 1889, in Istanbul, he made significant contributions to the understanding of this disease, which is characterized by recurrent mouth and genital ulcers, skin lesions, and eye inflammation. Behçet's work laid the foundation for further research into autoimmune disorders. He published numerous articles and conducted extensive studies, helping to raise awareness of the disease in the medical community. His legacy continues to influence dermatology and immunology today.