• Erythema induratum (associated with tuberculosis)
• Nodular vasculitis
• Erythema multiforme
• Lupus panniculitis
• Poststeroid panniculitis
• Contusions or bruises
• Sweet's syndrome (acute febrile neutrophilic dermatosis)
• Subcutaneous fat necrosis (associated with pancreatitis)

Associated conditions

• Infection: streptococcal, coccidioidomycosis, other fungal (eg, histoplasmosis, blastomycosis), tuberculosis, syphilis, Yersinia enterocolitica
• Other: sarcoidosis, medications (eg, oral contraceptives), inflammatory bowel disease, pregnancy, lymphoma or leukemia, Behçet’s syndrome

• Papules and nodules
• Subcutaneous nodules
• Arthritis and skin nodules