PRP for hairline to reduce forehead? (photo)

As a point of clarification, most surgeons performing hairline lowering are not using screws or anything permanent to hold the hairline in its new position.  Most surgeons either use Endotines or bone tunnels with absorbable suture.  I agree that PRP would have no use in your situation.  One cut and paste stock answer by a surgeon below is not relevant to your situation.  

Prp is effective, but I have a very specific protocol, every 3-4 weeks for 6 months with prp therapy. I also add in progesterone to speed the healing process.  After that the injections are tailored down. You should also be on viviscal and other growth promoting ingredients. Cost will vary. See an expert for a formal evaluation. Best, Dr. Emer

In  my opinion, PRP will not change a natural hairline. It can improve the thickness of the hair shafts, however the shape of the hairline will remain the same. Hair transplantation and scalp reduction are viable  surgical alternatives.

Sorry, PRP works by regenerating hair follicles. It you haven't seen hair in any location for more than 4 - 5 years, PRP won't help. In your case, there never were any follicles to regenerate.
I definitely don't recommend it for you, but a hair transplant is about the only way to have hair there.  
Wish I had a good solution for you. Hope I've helped in some small way.
Warmly,
Arbella Sarkis, MD

PRP will not bring your hairline down or make your forehead appear smaller. PRP can be used to thicken your existing hair.