Lymphangiectasia is characterized by vesicular dilation of lymphatic vessels and is generally a complication of radiotherapy or surgery of various malignant tumors such as breast and cervical cancers. Although it is not a precancerous disease, correct diagnosis is important to rule out Stewart-Treves syndrome which is defined as lymphangiosarcoma that develops in long-standing chronic postmastectomy lymphedema. Observation alone or many therapeutic options including cryosurgery, electrocauterization, sclerotherapy, and excision have been widely used in the management. Herein, a case of breast lymphangiectasia was presented as a late and rare complication of breast cancer-related therapies.