DD is 2 and has developed this habit of scratching her face absent mindedly. She now has scabs on both cheeks which never have a chance to heal as she scratches them off...have tried plasters etc, but they just irritate the skin and she picks at them even more. Nails cut as short as poss but still sharp talons and if I try and explain to her that it's not a good thing to do she gets very defensive. Help, what can I do to stop her?