If an aluminium skinned a/c gets "dinged" it's patched.
How do you repair a similar problem on a composite?
With a patch...
The necessary materials are provided IIRC as part of the 787 maintenence support package. Small dings can be repaired in an hour and last for ~5yr, more major problems get an overnight treatment that is good until the next major check which on the 787 will be at 12yr intervals.