I disagree. Oil based makeup products most definitely can break acne-prone skin types out. Fragrances can cause irritation and dermatitis but oil can cause comedones which will most likely manifester into acne breakouts. Make sure you always check the ingredients of the products you purchase whether it be skincare or makeup.

It doesn't have to penetrate. Just clog the pore and boom.

It does- for instance i broke out from Revlon nearly naked because of the jojohba oil (is that how you spell it?) in it.

I will tell that to my skin, which decides to erupt in spots after I wear foundation!

My doctor told me that cosmetics definitely cause acne. After all these years dealing with my skin, I believe him.

It's right here on the site - http://www.acne.org/makeup.html

It does. The pore gets clogged, and the sebaceous gland produces sebum as they normally do, and the sebum builds up under the skin because it has no where to go, to excrete and causes inflammation.

Yes I'm pretty sure I have always had acne since I was about 13ish. Then I started using makeup to try and cover up. My acne went from mild to severe and hasn't been right since. Makeup that states non comedogenic, or for all skin types. Completely wrong.

I think the poster has a bit of a point - most of what I have read on this topic talks about acne cosmetica, which does exist and is acne caused by makeup and skin care products. It usually presents as non-inflammatory, like dermatitis. However, certainly people who are predisposed to cystic acne could expect that this type of irritation would worsen their condition, and seem to 'cause' or worsen inflammatory acne as well.

Cosmetics can clog pores, and different people have different reactions to that. However, it is likely that if your cosmetics are aggravating your acne you will experience some dermatitis (redness or bumpiness) with that like the IP indicated, which can help you to tell that the cosmetics are causing it.

This is incorrect!

Don't listen to this poster. I do not have hormonal acne, except for 1 monthly menstrual cyst. However, I am a makeup junkie. I ONLY breakout from new products. When the breakout clears, my skin goes back to being clear.