Is there a permanent solution to this thick hair parting at the back of my head? (Photo)

You may want to see your dermatologist. If the hair parts like this just because that’s your normal, there is not much that can be done although your choice of shampoo and general scalp health might make a difference in these cases. If your hair parts like this due to early androgenetic type hair loss (or some other hair issue), there may be strategies to stop the process from getting worse or even thicken it up. I would encourage you to visit your dermatologist and review the area up close.

Hello, Dr. George Abrahamian here from LA FUE Hair Clinic in Pasadena, CA. Based on the photo shared, it looks like a normal part of the hair, where the hair naturally grows in different directions. The main questions to ask yourself is whether this is new, is it worsening or it has always been there. If it has always been there then there isn't much to do, as it is normal for hair to grow in different directions creating a part. If it is new, or worsening, then the best course of action would be to speak to your dermatologist to see what may be causing it, and what interventions may be in your best interest.
I hope this helps!

Hello and thank you for your question. More than likely its just how your hair is and probably not much you can do. You might want to see a dermatologist to see if there is something brewing or if everything looks ok. Best wishes.
Dr. T

If there is an isolated area of hair thinning you could apply topical minoxidil as well as inject PRP into the area. Alternatively, you could part your hair in a different manner so that the scalp would not be visible.