Sometimes the urges become quite strong, and sometimes I can be impulsive. Tonight, I suddenly felt a strong urge but I got a pen and drew lines on my arm, pressing pretty hard. With eyes closed the sensation was similar to cutting and it left a mark too, if only an ink one. I know that this has been suggested before, but what I did next was to go to the bathroom, get a stiff nail brush, wet it and add a little soap and scrub the lines I'd just drawn off. It's actually quite painful, like... dare I say it... satisfyingly painful, but obviously a lot safer than cutting and there's no marks except red soreness which throbs  and stings just like after you've actually cut.

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Maybe someone else might find this useful, let me know if so :)