Is it possible to get rid off the hole like indentation on my forehead? (Photo)

In general, chicken pox scars do not fill as well as depressed acne scars. An examination would be necessary to determine your candidacy. In our practice, we prefer to use Silikon-1000 for suitable depressed scars. Silikon-1000 is an off-label filler for permanent results.Hope this helps you.Dr. Joseph

It does not look very deep but hard to tell in a picture.  It does appear to be darker than the rest of the skin which may be what you notice.  You could try some laser or IPL first to lighten the skin, and then put some filler in underneath it to elevate the hole.  As it is small, you could also remove it surgically.  This would leave you with a small linear scar.  

Although it is difficult to say without an in person
examination, it is possible that you may benefit from topical creams to help lighten the discoloration as well as non-ablative skin
treatments. Injectable filler such as Juvederm, can often be helpful
to fill in depressions from scars. I suggest you schedule a consultation with
a board certified plastic surgeon in your area to see what options fit your
goals and budget.