Is there hope for lump on my left butt cheek after BBL? I had it performed January 2017 in Mexico. (photos)

Hello and Great Question.  I appreciate the time you are spending researching this procedure.  My name is Dr. Matthew J. Nykiel.  I am a Board Certified Plastic Surgeon, a Fellowship Trained Cosmetic Surgeon, and a Butt Augmentation Specialist.
If it keeps filling up and lipo isn't treating it, then I don't think it is fat.  It may be fluid (seroma), which can be treated differently first with draining, then with injecting fluids, and finally with cutting out the fluid cavity.
I hope that helps!  Best of Luck!
Matthew J. Nykiel, MD#TopREALSELFDoctor#CoreREALSELFDoctorButt Augmentation SpecialistLiposuction SpecialistBoard Certified Plastic Surgeon

Dear sunnicali,an examination would be required to get more information. Based on your photos, it looks like your bump is pretty big. Generally speaking, unevenness and bumps after a BBL can be reduced with liposuction. I would suggest you to consult a board-certified plastic surgeon.Daniel Barrett, MD, MHA, MS
Certified, American Board of Plastic Surgery 
Member, Am. Society of Plastic Surgery

This is a good example why doing procedures abroad is not a great idea - if something untoward happens, you are on your own.   Sounds like you developed a fluid pocket, or a seroma.    After a few weeks, the seroma makes a wall of scar tissue around it, and unless you have that wall excised, the mass will remain.