Erythema multiforme is most commonly caused by?
Correct Answer: Idiopathic
Description: Ans. is 'b' i.e., Idiopathic Idiopathic erythema multiforme is the most common cause of EM. Herpes simplex is the most impoant infectious cause of EM. Causes of Erythema multiforme Idiopathic --) Most common cause Viral --> HSV (most impoant) HBV, Mumps, Adenovirus Bacteria - Streptococci, tuberculosis Fungal --> Coccidioidomycosis, Histoplasmosis. Drugs ---> Antibiotics (Sulphonamide), Phenytoin, NSAIDS. Autoimmune disease --> SLE, thyroiditis, RA Others --> Sarcoidosis, Pregnancy, Malignancy.
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