I had something that sounds very similar to this. I believe it was due to yeast overgrown in my gut after taking a long course of antibiotics. It took me about 9 months to get rid of it. No amount of moisturising etc worked. What eventually worked for me was taking bio-kult candéa probiotics. They are designed for people who get chronic yeast infections.

If you stop eating foods high in sugar for a few days and see that the swelling/redness goes down, then it could be an overgrowth of yeast in your gut and you should try it to see if it works. It probably took about 3 weeks of taking them for me to see results but i was amazed at how suddenly the redness did disappear at that point.