Possible Triangular Alopecia

This young man sent these photos to me asking about this area of extreme thinning, which appears in the same place, even on the other side of his head. He said he had this same thin area when he was younger and it is also on the other side of the head, just less prominent.  This is often an inherited balding area called triangular alopecia, which is always found in this area. A simple hair transplant can permanently fix it if it is triangular alopecia. It could be alopecia areata, which is rarely in the same place on both sides of your head.