Brief Answer: Lymph nodes most likely... Detailed Answer: Hi, I am not very sure what you meant by grease balls; perhaps you were referring to fat lumps or lipoma. If you really meant lipoma, then it is not always painful. In fact most lipoma are painless lump. I would think of lymph node enlargement as the most common cause of 3 painful balls in the armpit. If these are not lymph nodes, I would think of infected follicles before considering lipoma. As its hurting you, you can safely use over the counter pain killers for a day or two and watch over the lumps. If deemed necessary, I would order for FNA biopsy or excision of the lump after performing an ultrasound examination. Overall, I am not be overly concerned with these 3 lumps. Hope this helps. Let me know if you need clarifications. Regards

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