1. Not Moisturizing Breakout-Prone Skin
Because oil can lead to clogged pores and eventually breakouts, many acne-sufferers don’t moisturize their skin. It is a common misconception that skin prone to acne and breakouts should be dried out. In fact, it is even more important to moisturize it as breakouts are exacerbated by inflammation and dryness. Building back the skin's healthy barrier cannot be done without effective hydration. There are many amazing lightweight formulas on the market that work well for acne-prone skin. Just don't forgo moisturizing altogether.
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2. Using Too Many Products in Your Routine
Using lots of different products to try and help skin can often lead to overstimulating it, leading to more problems. Not paying attention to product ingredients and the interplay between those ingredients leads to skin conditions like breakouts. A simple, pared down skincare routine (cleanse, tone, serum, moisturize) gives your skin has a chance to get used to a regimen and build back its strength.

1. Overusing active ingredients and acids such as retinol & salicylic acid
It's natural to drown a breakout in strong ingredients that will dry it up and fix things instantly. Calming, antibacterial ingredients like rose water, tea tree and witch hazel are great for this. Acne-prone skin may be dehydrated, so it is essential to focus on hydration and calming by treating the skin with antioxidants and anti-inflammatory ingredients to build the health of the skin. 
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2. Avoiding sunscreen because they’re too oily
Many traditional facial SPFs can feel and look greasy on the skin, clogging pores and hence creating more blemish issues. However, there are many formulations that are completely non-greasy and work to protect the skin from the sun while not bothering problem skin. Look for oil-free, mattifying and organic sunscreens.