[Circumscribed pseudolymphomas: definition, diagnosis and differential diagnosis].

Pseudolymphomas are benign reactive inflammatory lymphoreticular proliferations in the skin with potency of spontaneously regression. Despite of different etiology the patho- and morphogenesis may be largely uniform. The differential diagnosis includes numerous chronic granulomatous processes, but above all true (malignant) lymphomas. Histologically there are characteristic the kind and pattern of the infiltrate as well as (mostly) the absence of typical signs of malignant proliferations.