When lipomas are removed there is a void--an empty space that should be filled. A plastic surgeon utilizes techniques like "undermining" and "multilayered suturing" in order to pull the deeper layers over the bare bone and fill in the deficit. Usually these techniques fill the hole...
Large lipoma removal of the lower back is prone to seroma formation.It is obvious that your Dr has tried to protect you suggesting a small drainage the time of wound closure.Seroma formation and spontaneous drainage from the wound is not a serious complication but it will forced you to go back...
Surgical biopsy with removal of the mass is appropriate. Our office specializes in mole, cyst, and lipoma removal in Los Angeles. Best, Dr. KaramanoukianRealself100 Surgeon