How to fix vertical line on forehead? (photos)

While overactive corrugator and frontalis muscles can lead to the angular indentation that you see near your brow, it is very unlikely that the central depression in the superior part of your forehead is due to that, as wrinkles in that area are typically horizontal and not vertical. I would agree with discussing this with your primary care doctor and possibly seeing a dermatologist to assess the skin in that area. Early linear scleroderma/coup de sabre is definitely on the differential diagnosis list, and there is potential to halt its progression by starting on medication early. Once it is stable, it can be treated with fillers or fat injection. My recommendation would be to see a board certified/eligible dermatologist for evaluation, and if they feel you need to see a rheumatologist as well they will be able to refer you. Best of luck to you!

I would put filler in that crease and maybe botox. That crease maybe coming from the muscle action as well as how you are sleeping.  A good exam would tell which one or both.  

That isn's such an uncommon problem, I see it more than occasionally, and find that a combo of Neuromodulator, liek Botox or Dysport first to relax the corrugator muscles laterally and if that doesn't help then very small amounts of filler along that line might help. Remember that both are temorary, and will need to be repeated in future.  Make sure you use a experienced injector.Best of luck,Dr G