I don't think that it necessarily means that one is predisposed to SI, but I do know what you mean. I used to pick at my lips until they bled and have always picked at scabs, my skin and bitten/ripped my nails. I never really considered it SI and didn't know what I was doing. It's only now I'm older that I'm starting to realise how young I was when I first took my anxieties out on my body.
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