This book provides a complete summary of the clinical features, phenotype, pathogenesis, histopathology, diagnosis, and treatment of lymphocytic infiltrates of the skin. It begins with a clinical atlas and introduction to the ontogeny and biology of the lymphoid system. The next section discusses novel molecular approaches to the diagnosis of cutaneous lymphoid proliferation and benign lymphocytic infiltrates. The remaining chapters focus on major inflammatory skin diseases and lymphoproliferative disorders, including chronic lymphocytic leukemia, lupus, adult T cell leukemia, and primary cutaneous Hodgkin.s disease.