I have this indentation on my forehead and would like some advice for a possible solution (Photo)

You have a contour irregularity, actually several, and they can all be improved with use of injectible fillers.  There are several types available but a long lasting HA filler like Voluma will give you the longest correction and possibly have some even more longlasting effect over several years of use.  It is very safe and dependible.

Yes this can be corrected after I find out the results of a ct scan to determine what is the cause of this, bone or skin and subcutaneous tissue. 

to determine whether this is truly a dent or because its surrounded by lipomas.  It can also determine if this is truly external to your skull or not.  But improvements can be made with what you have but you must invest in a consultation with a local board certified plastic surgeon.

Your forehead indentation is caused either by a bony or soft tissue defect. A CT scan would be needed to make that determination from which ether bone cement (bone defect) or a fat graft (soft tissue defect0 can be used for its correction.

Thank you for your photo and question--I do see the indentation that you are describing and it can very likely be improved.
There are a variety of options in a situation like this. Bone remodeling via surgery is one approach; however, many patients can have significant improvement with injections to fill the "divot" with HA fillers. 
Best of luck!  

There are a number of relatively simple options, but I would want to have more information about the dent. A CT of the skull would be helpful to identify the entire problem and how thick the underlying bone might be.  You would like to know if there is any defect in the bone that would contraindicate some treatment options.  I would see a plastic surgeon with craniofacial expertise to help you make a good decision.

A CT scan is needed to determine the cause, before a treatment plan can be determined to correct the problem.