[Criteria for the differentiation of pseudolymphomas and malignant lymphomas of the skin].

Cutaneous pseudolymphomas are biologically benign disorders which are characterized by their close clinical and histological similarity to malignant lymphomas. The most important criteria which permit their differentiation are clinical features (course, typical findings like light sensitivity in actinic reticuloid), histology, immunologic characteristics of the infiltrating lymphocytes (membrane and intracytoplasmatic immunoglobulins, membrane and nuclear antigens), as well as detectable chromosome aberrations.