I've just found out that sodium laureth sulfate and sodium lauryl sulfate are comedogenic (pore blocking and acne causing), especially the lauryl form.
This is bad news for my facial skin. I mentioned in a previous post that my body skin isn't fussy, but shampoos and face washes that contain those sulfates could be partially responsible for my facial breakouts.
Also I just popped on a new sample of a moisturiser, then looked up the ingredients -- wheatgerm oil is highly comedogenic too. Washed that off tout de suite!
Hope that helps if you were clueless like me.