What could cause clothes to come out of the dryer with tiny burn or scorch marks?
Pop open the front panel under the door and vacuum out the lint. It collects inside the housing and pieces get drawn into the air heating elements and blown into the drum. Having nothing to do with the lint trap, this stuff accumulates because it slowly migrates through the felt drum seal.

You may have a potentially dangerous situation here. Any other type of materials that get into the cabinet will also get vacuumed up and blown through the heating elements (glowing coils) which essentially turns them into glowing embers.

The air heater has a thermal limit switch that is supposed to break power to the elements if they're overheating. This kind of overheating will brown large areas, not pinpoints.

Make this cleaning task a six month or yearly scheduled event.