1. Silicones can cause acne or worsen it

Silicones form an impermeable layer on top of your skin. Because of this, they trap sweat, bacteria and other dirt that might have been on your skin between the film they form and your skin's surface. When you go about your business and your pores release oil, sweat etc., then that's also trapped with no where to go, eventually leading to clogged pores, inflamed pores and acne.

2. Silicones prevent beneficial ingredients from being absorbed onto your skin

Since they form a an impenetrable barrier on your skin, other ingredients that need to be absorbed will sit on the layer and not get absorbed. Ultimately this reduces the efficacy of your skincare products and let's face it; effective products aren't cheap! To get the most bang for buck from your skincare products, you need ingredients that can form a breathable film on your skin (like Hyaluronic acid), that still let other ingredients pass through and be absorbed.

3. Silicones are bad for the environment

Silicones are not biodegradable. Instead they are bio-accumulative, which means when they're washed off and go down the drain they do not decompose, but start to be part of the ecosystem. Per Dr. Suzuki, they are toxic downstream and have been shown to bioaccumulate in aquatic organisms.

So what exactly is this ingredient still doing in skincare?!