A lump under the armpit may still grow after surgical removal. It may be related to acute infection, chronic infection, lymphoma, benign tumor, cancer metastasis, etc. Not all lumps need surgical treatment, and not all of them will recur, so it needs to be analyzed specifically. 1. Acute infection: If there is pathogen invasion, it may lead to red, swollen, hot and painful lumps in the area, such as folliculitis or acute cellulitis, etc., which may not necessarily require surgical treatment. 2. Chronic infection: it may be caused by tuberculosis, syphilis or AIDS, etc. After surgical excision, there is a possibility of recurrence. 3. Lymphoma: such as Hodgkin’s lymphoma, which manifests itself as painless lymph node enlargement. Generally, there is no need for surgical resection, but radiotherapy and chemotherapy (such as Imodium capsule, Porui capsule, hexamethylenimine, etc.), immunomodulating drugs (such as interferon, etc.), bone marrow transplantation and other treatments. If the enlarged lymph is surgically removed, it is easy to recur. 4. Benign tumors: benign tumors usually grow slowly, may be skin fibroma or lipoma, and the chance of recurrence after surgery is very small. 5. Cancer metastasis: Cancer cells can be transferred through the bloodstream, and if they are transferred to the armpit area, it will lead to enlarged lymph nodes. After surgical resection, there is a certain probability of recurrence and the prognosis is poor, further anti-tumor treatment is needed. If tumor is found in armpit, one should consult doctor in time, improve examination, make clear diagnosis and follow doctor’s instruction for treatment.