Which of the following is not a criteria for Sezary syndrome?

Sezary syndrome refers to the presence of a clinical triad consisting of .erythroderma, .peripheral lymphadenopathy and .atypical mononuclearcells (Sezary cells) comprising 5% or more of peripheral blood lymphocytes on a buffy coat smear (B1), or more than 20% of total lymphocyte count or a total Sezary count of more than 1000 x109/L (B2). It is a variant of cutaneous T cell lymphoma with aggressive clinical course. Ref: Rook's textbook of dermatology, Edition-8, Page-57.17.