Erythema Annulare Centrifugum is characterized by migratory annular, arcuate or polycyclic erythema with central clearing.
Its etiology is not conclusive but there axe many reports about the etiology, i.e. "due todermatophytid", "the drugs", "internal diseases", or "unknown etiology" etc.
A case of Erythema Annulare Centrifugum with unknown etiology was reported.
The patient revealed slightly elevated, migratory annular erythemas with central clearing on the both posterior portions of thighs.
Histopathologically, there was no abnormality in the epidermis.
In the dermis, cellular infiltrates showing fairly well demarcated perivascular "coat-sleeve like" arrangement and endothelial proliferation were seen.
The infiltrates consist of mononuclear cells.
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