A young female presents with a history of fever and nodular lesion over the shin. Histopathology reveals foamy histiocytes with neutrophilic infiltration. There is no evidence of Vasculitis. Most probable diagnosis is:

Absence of vasculitis, history of fever and nodular lesions with neutrophillic infiltration may be seen in Sweet's syndrome and Erythema Nodosum. However, presence of histiocytic infiltration is rare or uncommon in Sweet's syndrome and more common in Erythema nodosum. Therefore, Erythema nodosum is the right Answer amongst the above options and wins the duel with Sweet's syndrome. Ref: Tarascon pocket rheumatologica, by Andrew E. Thompson, Page 32; Vasculitis in clinical practice, by Richard A.Watts, David G.I. Scott, Page 153.