Breast lymphoma is uncommon, and it usually involves breast parenchyma and ipsilateral axillary lymph nodes. We report rare cases of cutaneous T-cell lymphoma involving the skin and subcutaneous fat layers mimicking panniculitis of the breasts in a 33-year-old male patient who presented with a growing palpable mass and pain in both breasts and in 17-year-old female patient who presented with an indolent palpable breast mass for 1 year. Extranodal natural killer/T-cell nasal-type and subcutaneous panniculitis-like T-cell lymphomas were diagnosed after skin punch biopsies. Here we report the clinical manifestations, mammographic and ultrasound findings, and the difficulties in histological diagnosis of the cases.