they can remotely inflict skin marks/"acne"/boils, i think they probably use some kind of surface mines that can be remotely detonated on the skin, leaving an ugly mark there (like how they probably shrunk the astronaut on the moon picture, which the surface is probably actually human skin)
small shocks to the surface of the skin, maybe induce itching, muscle twitching, from small to violent in intensity, dream manipulation, i wonder what else, definitely voice 2 skull technologies
