>>13421981I have this. I also have psoriasis in places and of course, dandruff on the scalp. What causes the redness is 1 part local irritation (shaving). The underlying is might be a reaction to the dandruff and the commensals in the dandruff, aka Malasezzia.
So what I do is trim the facial hair very short with the beard trimmer and wash the face with plain soap and water everyday, as well as get exercise, which is all sufficient to prevent conditions to arise that cause the irritation/redness.
tl;dr wash with plain soap and water. Pat dry. Improve diet and exercise. That is all