What Can I Do if I Got a Mole Removed, but It Left a Concave Scar?

The scar can be excised and resutured to bring it back to skin level.  This is a simple scar revision technique performed in my Los Angeles office. 

I would encourage you to wait 6-12 months before considering doing any procedure to try to improve the scar.  Your options may be to do some filler like Juvederm or Restylane in the area. 

When a mole is removed by shave removal or tangential excision the lesion is shaved off flat with the surrounding skin. Sometimes this can leave a depressed scar. Your options are "tincture of time," in other words give it some time since it takes 6-12 months to get the final result following any type of surgery. It might improve to some degree. The other option is to use a soft-tissue filler such as Juvederm or Restylane to reduce the depresssion. This would have to be repeated probably every year. Finally, a scar revision could be performed which would also improve the final cosmetic result. Talk to your doctor to determine the best option for you. Good luck.

This most likely occurred because of post care. If you don't keep the area totally clean and free from a scab, the new skin won't heal in entirely, leaving a divet. It can fill in a bit over time, but most of the time, a divet or small concave mark will always be there. You could have a revision (where the divet is removed via excision and closed with a suture). If you keep this site totally clean, free from all dried blood and scabbing, and do proper post care, you should have a tiny dot left is all. One suture would probably close it if it's that small. That could cost a couple hundred dollars.