Case for 2014 Dermpedia Hematopathology Conference: Large B Cell Lymphoma: Are you sure?

    A 54 year old male presented with 3-4 cm irregular erythematous nodule on the forehead. A biopsy was performed.

    The case was initially interpreted as possible diffuse large  B cell lymphoma. However, the clinician was skeptical of the diagnosis and the staging was negative.

    What isthe  correct diagnosis?