Leather that has been creased can be a problem depending on the type of finish it has on it. If it has a polyurethane finish and this has been creased the chances of removing it are pretty slim.
Heat can be applied with a hairdryer or iron and is sometimes successful. Cleaning and 'conditioning' products will make little difference.
The leather in the photos has been physically damaged by something hot and no amount of 'cleaning and conditioning' products can make it better. The leather in this instance would need repairing and recolouring. This is not the same as a crease.