Do silicone-heavy products trigger whiteheads/blackheads/milia?

I've read several different versions of what causes milia online and thought it'd be good to hear from some doctors .... I've heard to stay away from anything that lists "dimethicone" or similar silicone ingredients towards the top. I've heard "oil-free" is the way to go with products including makeup. I've heard oils can help my smooth my combination skin. What causes milia and clogged pores? What products should I use / avoid ?

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