Hi Verity,
usually it would have to do with a felt sense of touch. If the client herself comes up with this association I wouldn't exclude the possibility though, especially regarding hair loss, as hair work also like sensory "antennae". Also, skin can act as excretory organ to get rid of toxins and emotional toxins. If you lose your higher purpose, what's left might feel like a toxin? Of course, these considerations would need to be confirmed by the client.