12 days ago, I received a plastic surgeon using my own stem-cells in South Korea. The doctor injected the stem-cells around my eyes, and then I returned to China. I found there are a few lumps under my eyes, and I asked the doctor why it's happenning. He told me that it was normal and the lumps should disappear in two or three weeks if I kept hot compressing and massage gently. However the bumps are still there so I get a little bit worried. Can you please tell me what causes the lumps?