Axillary lymph nodes 1.2cm*0.5cm, with blood flow signal suggesting that the lymph nodes are full of blood vessels and large in size, resulting in the possible causes of benign diseases such as lymphadenitis caused by bacterial infections, but also malignant lesions caused by enlarged lymph nodes. 1. Benign diseases: patients with a recent history of colds and mouth ulcers are prone to infections, and lymphadenitis caused by infections will also show enlargement and abnormal blood flow signals, which need to be diagnosed in time. 2. Malignant lesions: lymphoma, lymphoblastic leukemia, lymphatic metastasis of malignant tumors can lead to painless and progressive enlargement of axillary lymph nodes, which need to be promptly biopsied. For patients with enlarged lymph nodes, they need to consult a doctor in time, complete the relevant examinations to make a clear diagnosis, and carry out standardized treatment under the guidance of the doctor to avoid deterioration of the situation.