It could well be said that stress causes acne. When your body gets stressed, it produces more oils, it actually weakens the body’s natural defenses, etc. Essentially speaking, you are more likely to get sick because the bacteria are waiting for you to become vulnerable in general, and stress opens up that door. Likewise, of course that same bacteria can actually cause more acne and otherwise cause more problems in general terms. So with the increased sweat production, oil production, and moreover it stop being able to fight as effectively against bacteria as it could in times of low stress or otherwise. So if you are in times of stress, this would explain why you get more acne. In addition, your hormones are more likely to flare up, and otherwise there are more likely to be other problems associated with the stress and therefore acne associated with that stress. There are some who would of course say that stress has nothing to do with it just as they would say that diet has nothing to do with it. But the reality is that all of these things have some relation and all of them have to be considered.