Anyway, I've found a good tip to share with you on how to calm, maintain or prevent it. Use Fancl Acne Care Series after proper skin cleasing. Starting with Fancl: Lotion AC - Care Essence - Moisture Gel - Oil Control - Oil Control Powder. By going this product series, it helps you to moisture, nourish and control your skin.
Never skip the moisturising step!
Do not have the wrong perception that acne prone or oily skin doesn't need to be moisturized. To be right, acne skins has to moisturised in order to have the skin restored with moisture to reduce excess sebum production. By maintaining it well, it will prevent accumulating of oxidised sebum forming the pimples or acnes.
A lot of times, having intake of supplements helps.
Other tips, always remember to remove your makeup completely and before sleep. Fancl mild cleansing oil is so far my favourite makeup remover as it is never too harsh on the skin and can remove thick or heavy (waterproof) makeup without any hassle or much efforts since it melts them away within spilt seconds.