Nose Piercing Indentation Mark and Discoloration

It is likely that the piercing will diminish in size but the hyperpigmentation may take up to two years to lighten. Some lightening creams may provide improvement,  

Scars that are the result of piercings can be challenging to improve and can cause patients anxiety and embarrassment.  The good news is that treated properly, they can become almost imperceptible. The scar gel you are using may help somewhat to fade any discoloration, but will never remove the hole or scar. The scar itself and any hole will be need to removed surgically and repaired in layers. I would recommend you seek a surgeon with experience with nasal anatomy and can examine the inner lining of your nose as well. The treatment is very similar to repair of scars left from heavy earrings or ear gauging/stretching which require excision with careful layered closure. Best of luck to you