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(a) Nodular lymphoid infiltrate extending from the superficial dermis to the deep dermis, with a focal interface at the basal layers of the epidermis. (H&E, x100). (b) Polymorphous infiltrate with a predominance of small mature lymphocytes. (H&E, x 200). Immunohistochemistry shows a mixture of B and T cells, highlighted by CD3 (c) and CD20 (d) respectively, with a predominance of T cells (x100).
