Something is wrong 6 years after BBL - can someone please explain? (Photo)

Appears as seen the posted photo an old fat necrosis abscess that has formed and is expanding. You need immediate incision and drainage of the area. Seek a local Plastic Surgeon in your city if you do not hear back from your original surgeon. If you come to Miami, I could offer surgery. Best to virtual with...

The timeframe of events is not clear based on your post. It looks to me like you’ve developed an abscess or infection and this probably needs to be treated right away.
Infections are typically noted first by being very tender and then the area swells becomes more painful and feels warm.
By the time fluid is draining the infection is usually quite advanced. The treatment is to surgically open and drain all the infected material.
Fat necrosis usually presents within the first few months after the procedure and would not happen years later.
Based on what you describe I would encourage you to seek medical attention immediately. I suggest going to the nearest emergency room. It would be particularly helpful if they have a plastic surgeon on call but any competent doctor including emergency room doctor or general surgeon should be able to help you with this.
Generally speaking I do not recommend patients travel long distances for elective surgical procedures. The importance of having multiple in person consultations, the need for an in person follow up care, the number of people who end up needing revisions and that complications actually do happen seems to be forgotten by all too many.
I recommend you do not wait further and seek medical care as soon as possible which most likely is going to the emergency room.
Best,
Mats Hagstrom MD