Little kitty Inka does this all the time too ... You should see the scin of my right hand
Shouting a loud "NO !!" usually helps here . I think she does this because she is getting new teeth ... Isn't this exactly what human babies do , chewing on everything when they get their first teeth ???

Of course , as her teeth are a bit larger now , and VERY sharp , it is no fun anymore .... ! Please Inka dear , mind mommy's silky scin ....