9 Weeks Post BBL: lumps in stomach and possible fat necrosis in butt cheek (photo)

Hi, This is the 9th week since my surgery. My stomach doesn't seem to be improving and still is lumpy... What can I do? Will heating pad, massage roller and ultrasonic (portable handheld) machine help? Also, I just recently felt a hard "lump" inside my left butt cheek. You can't tell from looking, it doesn't hurt unless I massage it. About two weeks ago, my friend was playing around (didn't know I had surgery) and stuck me on the butt really hard. Would that be the reason why there's a lump?