After 3 weeks, it is much too early to tell whether the pits you see are permanent. They may indeed fill in completely all by themselves. Although some people swear by Vitamin E or Mederma creams (both over the counter), the best I can say about them is that they're harmless.
There's one other thing you may want to look into: laser resurfacing. If scars are peeled superficially with a laser very shortly after they start--such as n your situation--they may heal better. I'm honestly not certain this will help, or be necessary, but it isn't a large or risky procedure and nnedne;t therefore be too costly. You might therefore want to look into a dermatologist in your area who performs laser resurfacing and ask for a consultation.
Best.
Dr. Rockoff