What is causing my facial redness? (photo)

I am 43 years old and have noticed redness on my inner cheeks gradually developing over the last year. Could this be caused by pollution and weathering (I have walked to work along a busy road to work for the past 25 years), an alcohol based sunscreen, a foaming cleanser or isotretino ( I have an oily skin and have used isotretinoin every other night since I was 17)?

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