I am 1 1/2 weeks post op BBL. I have been wearing my garment as instructed, but my ab foam is leaving a mark. Is this permanent?

In my experience indentations caused by the  garment, boards or foam can be permanent. After liposuction the fat beneath the skin becomes mobile and the garment or the foam could push the fat from one direction to the other. Trying to massage these indentations to make them smooth has worked for me. You need to go back to your doctor and see if the foam could be adjusted so it does not leave any marks. I think it's a good idea when you put on a new garment, a foam or a board that you check the skin in a couple hours to make sure it's not leaving any marks. 

This is very normal. Immediately after surgery there is a lot of swelling and the garment and foam make indentations or impressions in the skin. Moving the foam around by a small amount each day helps...shift it a few mm to the right or left or up or down so the impression isn't in the exact same place every day. Most of my patients use the foam for ~2 weeks and the garment for a maximum of 6 weeks. After 6 weeks wearing a 1st stage compression garment can leave permanent indentations in the skin. Professional lymphatic massages or endermologie in the areas of liposuction will also help to smooth things out.