I've had some eczema my whole life. I believe it's food/diet/allergy/sensitivity related. Back when I was in my early teens my mom was reading some books written by allergists and did a food rotation diet for me. This means, you don't eat the same foods every single day, rather you eat the food once a week. For example, if you have milk on Monday, you don't have it again Tuesday, Wed., etc. You avoid it altogether till the following Monday. Same with all the other foods. This is hard to do, because milk, eggs, wheat, corn syrup, and so many other things are already in so many things we eat regularly. You have to make a chart and keep track meticulously. Then, when you start doing this, you observe to see how your body reacts to the various foods. If the eczema flares up when you eat a specific food, you have a clue as to what's causing it. I don't remember which food caused it for me, but I think it was milk/dairy and to a lesser extent wheat and red meat. My mom omitted those things from my diet altogether, and my eczema completely went away in about eleven months. Of course, as I became an older teen, I got sloppy and started eating all the things I wanted all the time (McDonald's, pizza, etc.), and the eczema came back. In my experience, it can move around. I've had it on both shins, knees, elbows, and arms. I even had it on my eyelids for a short time, but that was only for like a few months. These days, I think labs can test your blood for all the things you're allergic to, and you can find out what they are without the whole rotating foods diet. In either case, once you know what's causing your allergy, IIRC you have to omit it from your diet, and it takes the body about nine to eleven months to completely heal.
Presently, I have a patch of eczema on my right forearm between my elbow and wrist and, until recently, had a patch of eczema on my left shin. As for the patch on my shin, well that's quite amazing how that just recently went away. I was sick over the course of all last December. It was some sore throat, flu, earache thing - the worst I ever had. I had two courses of antibiotics, could barely get out of bed, and my appetite was nonexistent. I ate very little over December, and I even lost some weight. By the first weeks of January, I noticed the eczema on my shin was 98% gone! I say 98%, because there are some tiny white spots, but really I think those are just spots of healed skin that lack pigment. It never itches or flares up any more. The patch on my forearm is still there. I think if I fasted longer, another month maybe, it would be gone, too.
I'm also sensitive to pollen, and I've read that, though it's hard to believe, bronchial allergies/sensitivities are related to eczema. Should I post a few pics of the healed and not healed, or would you all be grossed out, lol?