We've all been there.
Here are some of the MOST common skin mistakes:
Making your routine complicated. You should never have more than two serums being used within a three month span. The constant switching and cocktailing makes for a confused face and a compromised barrier. Keep it simple!
Using dirty towels. It's a small investment for a huge impact. Toss them into the dirty laundry after each use, it's not worth the potential breakout. (Pillow cases fit into this category as well).
Keep the groceries in the fridge. DO NOT fall for the hype. Lemons, honey, tomatoes, etc should never go directly onto your face. Just don't do it.
Always do your skin routine after the shower. Your body washes, hair care, and bubble baths are almost usually full of pore-clogging formulas. Opt to wash after in order to thoroughly cleanse the face.
Stay away from makeup wipes! Throw the whole thing away. (I would say recycle but you can't even do that much).
The SPF in your makeup IS NOT ENOUGH. Always use an acne safe sunscreen after moisturizer and reapply with a spray version of it throughout the day (if you're wearing makeup). Even if it's a rainy day, even if you're indoors. Don't rely on your makeup for sun protection, even CC creams.