Dermatophagia is a bitch.
Get some of that nail polish that prevents you from biting your nails and tastes really sour and put it on your skin instead of your nails. It won’t stop you from biting necessarily but it will stop you from unconsciously biting.
Meant bitter, not sour. There is no way anybody likes that taste.
But even if you do, for me it wasn’t ‘this is so disgusting I’m not gonna bite anymore’ but more my brain snapping out of unconsciously biting as soon as I realized the taste and then you get a brief moment to consciously stop.