HI..thanks for the query..
You should not touch any eruption happening on your face for any reason.Every time you touch, the possibility of having scar( some of them permanent) and a superimposed infection increases tremendously.
About eating the blackhead
and piles from face, as you realize , this is definitely one of the most unhealthy practices that anyone has acquired.Acne
does not 'occur' due to eating them, but under all circumstances , this has to be stopped ASAP.
hope this helps..take care!