What Causes Cheek To Redden Overnight?

my left cheek gets extremely red at night. would sitting at the computer have anything to do with it? i have been using proactiv. and a have noticed a red mark on my cheek under my eye. it was on there all day yesterday. faded a lot overnight. and now its come back again. i had a mousturizer on and i was sitting at the computer. then all of a sudden my face started burning up. so i put some water on and it got worse