<prompt> Erythema nodosum is due to a Contraceptive pillsb Barbituratesc Penicillind Sulphonamidesbadacab  <response>: Causes of Erythema nodosumIdiopathicBacterial: - Streptococci, TB, Leprosy ENL, LGV, yersinia, mycoplasma, Rickettsia, Cat scratch disease.Fungal: - Coccidioidomycosis, Histoplasmosis, Trichophyton.Viral : - HBV, HIVDrugs : - Sulfonamides, iodides, oral contraceptives.Systemic diseases : - IBD Ulcerative colitis, Crohns disease, Sarcoidosis, Bechets disease, SLFMalignancy : - Hodgkins disease, other malignanciesOther : - Pregnancy 