symmetrical scar

[grannyscroggins]

Something ive always wondered about that hopefully you can explain.

I had what appeared to be a spot on my ribs. I squeezed it badly and it scarred. Then a matching scar appeared in the same place on the opposite side of my chest, in exactly the same relative location. As i grew more hairy they now also sprout the same kind of wiry long black hair.

Why has this happened?
I have a decent knowledge of human biology so dont be afraid to blind me with science.

Ta.

I thought id also add that i am a 25 year old male, as the mental image of the scarred, hairy chest of a geriatric woman may put you off your food.