quite likely an old injury re-broken,the forehead itself wont break from punching it. unless of course its already weak, the skull is incredibly strong, a hand would simply break long before the forehead would.
ive seen peoples forearm bone smash through the skin from hitting people on the forehead, in thai boxing we use it as a defence in this manner sometimes, lowering the forehead to make the punch hit that, thereby breaking the hand or arm.
No one in their right mind would target the forehead with a punch.
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