Well I do remember seeing this really weird case on the national geographic of a woman with a horn… (wasn’t a true horn but made of the same stuff!)
You see the difference between antlers and horns is usually that antlers are made out of bone… while horns like that of a rhino are actually made out of keratin whjch is pretty tough stuff… this is the exact same stuff that your hair and nails are made from and it can also be found in the outer layer of skin.
Now if I remember correctly this woman had some rare viral infection or something like that which caused the cells on a patch of skin on her forehead to become over active and produce way too much keratin… this happen over many many years and eventually the keratin protrusion ended up looking like a horn on her forehead.
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