Why do I have a hard lump above my incision one month after retouch lipo?

Hello, I had a full body lipo 6 months ago, I felt a hard lump above my incision line on my pubic area. A month ago a have a retouch lipo, the incision was done where the old incision was and the hard lump was completely gone, I was very happy but tonight (one more later) I feel a new small hard lump at the same spot where the first lump was. Why this hard lump was formed again? What should I do for this lump to be completely gone? Thank you.