This is air pockets not harm full it can be any colour and get imediate health care other wise your bird could die air pockets need to be poped it will go away after a few weeks or days keep babby warm
Necrotising faciitis in a diabetic foot: There is extensive subcutaneous emphysema tracking along the facial planes throughout the foot and distal leg. Note that the proximal extent of the subcutaneous gas is not visualized.
This pattern of subcutaneous emphysema is characteristic of necrotising faciitis. Make note that the proximal extent of the subcutaneous gas is not visualized, and more proximal imaging is needed to determine how axial this process has migrated.