Differential diagnosis of erythema nodosum

​Differential diagnosis of erythema nodosum are : 
-subcutaneous fat necrosis 
-Sweet’s syndrome 
-acute febrile neutrophilic dermatosis 
-contusion 
-bruises
-post steroid panniculitis 
=lupus panniculitis
-erythema multiforme
-nodular vasculitis 
-erythema induratum