My own boogers, dry skin, scabs, blood, eye "sleep," white acne "puss" after popping them, chewing on nail clippings? I used to stick my finger in my ear and suck it, bite my nails and chew my hair but haven't in a loooong time, and when i was a baby i ate sand at the beach. I also like the smell of my own (not others') farts and sometimes even poop... i am SO grossed out as i write this!!! If anyone else I knew did this I'd be grossed out!
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The best way for you to overcome them is by getting a stress ball so every time you’re about to do one of these things. You use the ball to pull at and pick at. I think this is based on nerves / stress but I may be wrong.
Good luck :D