Lumps in the armpits after pregnancy may be due to the following reasons: 1, lymph nodes, if the patient’s armpit lumps can slide, you need to consider whether it is due to lymph nodes caused by the lumps. If the lymph nodes are small, you can observe and treat them, and if you feel pain, you need to go to the hospital for further treatment.2. Sebaceous cysts, if the patient’s armpit lumps can not slide and black spots appear, you can consider whether it is due to sebaceous cysts, and you can use surgical excision to treat them, and at the same time, pay attention not to press repeatedly, or they will be prone to inflammation.3. Fibroid tumors, if the patient’s lumps cannot move, and there are no black spots, and the patient’s lumps are not moving, and there are no black spots. If the patient’s lump is not movable and there is no black spot, and the lump is hard, you need to consider whether it is caused by fibroid tumor, and it can be surgically removed.