I don't think there is any hard and fast rules as to where Testosterone induced hair growth will become apparent.
In my own case my thighs were pretty hairy before but did become slightly more so after however I have noted hair growth where before there was none ie chest tummy and shoulders, not huge amounts by male standards but before there was practically none.
It all comes down to your own personal genetics as to where or if there is an increase in hair growth and distribution.
