Usage patterns
ニキビができるto get a pimple
I recently got a pimple on my forehead.
ニキビを潰すto pop/squeeze a pimple
If you pop a pimple, it tends to leave a scar.
ニキビが治るfor a pimple to heal
After applying the medicine, the pimple healed quickly.
ニキビ跡が残るfor a pimple to leave a mark/scar
Touching it too much can leave a pimple scar.