I’ve been taking Propecia for many years (generic over the last year), and my hairline has remained stable ever since. I just noticed a nickel-sized bald spot on my crown. I thought Propecia worked better on the crown than on the hairline, so what gives?
Propecia is a medication for the treatment of genetic male pattern balding also known as androgenic alopecia. It works best for treating the thinning / balding on the top and crown areas of your scalp. It does not work as well for the front hair line. Propecia is not a cure and its response is different in each individual. You may still have thinning or continue to lose hair. The point is that it should slow down the hair loss. There is no cure for genetic balding.
You should see your doctor. A bald spot the size of a nickel could be the result of other causes like alopecia areata. A clearly defined bald spot is not a presentation of genetic male pattern balding so you must be assessed by your doctor.