If there is a lump in the armpit and there is pain on pressure, consider two reasons. The first consideration is whether it is an enlarged lymph node or lymphadenitis in the armpit, which can be treated with anti-infection treatment, such as oral amoxicillin, etc. It is advisable to go to the hospital for ultrasound to make a clear diagnosis. The next consideration is a cyst or lipoma, which is a benign disease and does not require too much worry. It can be removed through surgery and then pathological examination to clarify whether there is malignancy, and basically will not recur after surgery. You should pay attention to local hygiene, avoid spicy and stimulating food, get enough sleep, and avoid pressing and stimulating the affected area with your hands to avoid infection. If the bumps are relatively large, surgery and biopsy are needed to prevent the possibility of malignant changes.