You've probably encountered meth/ice users. The drugs themselves dont cause the skin problems, its usually one of two things; these drugs are often cut with a substance known in the trade as MS. It is pretty toxic, though not as toxic as the drugs, & it is expressed through the skin causing irritations. read more
The skin depicts what is happening in the body. A person who is healthy will have a healthy appearing skin. Drug users frequently have poor diets and lifestyles, and it show on the skin - and the skin of the face is the first thing you see. The holes you describe are most likely acne scars, and do not necessarily mean drug abuse. read more
Those sores on their faces are caused by meth. Often times users will feel like there are bugs crawling under their skin on their face, and they pick at it until it bleeds. Also, meth and heroin are often times cut with sugar, and when injected into the veins, sugar causes acne. read more
Most people that are on METH have holes in their face because METH has chemicals and substances in it , almost like bleach, that after a few years of using it the chemicals start eating ones skin up, thats how they get the holes and lose teeth and hair and all. read more