|A.||acne-like lesions over the back and face|
Explain: Patients with Behçet disease frequently have a variety of associated skin lesions. Lesions resembling erythema nodosum are frequently present over the anterior surface of the lower extremities. These lesions typically resolve over a period of several weeks. Patients may also display typical acne-like lesions, folliculitis, or thrombophlebitis. Cutaneous hypersensitivity is also characteristic of this condition. The behçetine (pathergy) skin test performed by puncturing the skin with an empty hypodermic needle may be useful in making a diagnosis of Behçet disease. A positive test is indicated by the formation of a pustule at the puncture site within minutes. The pathergy test is most likely to yield a positive result.