It’s been 1 year and I have hard lumps in butt - am I able to get a revision in this condition? (photos)

Only 1 side view posted photo? Your description is of fat cysts with or w/o internal cystic fat necrosis. Only ultrasound of areas might determine exact location/size of these areas. In my office ultrasound fee $500. Spo Lipo revision and BBL Revision/Reshaping fee $6,500++. Best to virtual consult with..... Must be done by boarded PS with experience in BBL revisions.

Your toast is a bit lacking. First and foremost any person who has concerns about the outcome of a cosmetic procedure should always include proper before and after pictures when seeking an opinion about the outcome. If you don’t have proper before and after pictures and asked your surgeon to forward the ones they took.
Your surgeon is also the right person to follow up with regarding your postoperative complications or concerns.
It sounds like you have areas of fat necrosis from using less than ideal technique for the BBL procedure.
When you say you want to revision it would be helpful if you could explain what you’re trying to achieve. do you want a bigger bottom? Change the shape? Remove the lumps?
First thing to do is to follow up with the surgeon who did your procedure. If that doesn’t work then seek second opinions with other local board-certified plastic surgeons in your community.
Gluteal pain can come from many different areas and if it didn’t happen until a year after the procedure it’s likely that it’s not from the fat transfer. sciatica pain most commonly comes from some problem with the nerves in your lower back. there are multiple reasons for having gluteal or hip pain. Hip arthritis is one of them.
For hip pain I suggest you start by seeing your primary care doctor and ask to be referred to a pain specialist.
Best,
Mats Hagstrom MD