Thanks for posting your query.
Holes will occur if pimples
are not treated properly, or if pimples are squeezed of if there is a family history of scarring.
The fact that you don't have pimples at present shows that the disease has resolved.
Holes have to be treated surgically. There are many methods which a dermatologist
will do. For example superficial ones may be treated with micro dermabrasion
or derma roller, which can be repeated once in two to three weeks depending on your response.
If you done improve after a couple of sittings I suggest you to go in for LASER
resurfacing or Radio frequency ablation on the skin.
You may discuss all these procedures with your dermatologist as there is no single procedure which will take care of different types of scars