Flat spot/indent after BBL - will this go away or do I need more fat injected there? (Photos)

Hi,
The indentation may change over the next few months but somewhat unlikely. Your surgeon would not likely consider this the appropriate time to "touch it up". Pillows offer little benefit at 4.5 months. Good luck.

Hi and welcome to our forum!
After liposuction and fat transfer, the inflammation of healing causes massive swelling in the operative areas, which initially obscures the entire result. There will be lumpiness and unevenness. 60-80% of the swelling will subside by the 6th week, with the remainder dissipating over 6-12 months. 
At this time, one cannot discern between swelling versus true contour irregularity. It is far too early to assess the result. If the indentation persists at 6 months, a simple revision can correct the problem. 15% of cosmetic surgery procedures require a secondary touchup.
Continue followup with your plastic surgeon.
Best wishes.