piddy.
When you say the corners, I am assuming you have a cube shaped head?
Unless you are under 18-19 years old start taking 1 mg of finasteride a day.
this can be had from:
1 propecia tablet a day (propecia is 1mg of finasteride)
or
1 fifth of a proscar tablet a day (proscar is 5mg of finasteride)
or one of the various generics
plus...
Shampoo your cube at least 1 or 2 times a week with Nizoral shampoo.
see how you go for a year or so, and only then if you feel you need regrowth look into Rogaine (minoxidil)
good luck with the square head thing
Ty