It sounds like you have a very difficult issue on your hands. As many have alluded to already there seems to be an abundance of methods to tackle eczema with some more fruitful than others. You may have heard of a few natural methods which are starting to become increasingly popular of late, one of which was tried by a family member. We were all really pleased to see very favourable results over a long term and so it�s something I thought I would mention in the hope that you may find it beneficial. After a lot of internet trawling I came across one site that appears to be a very safe source of reliable information as it provides a comparison and review of natural eczema treatments. I really hope this is somewhat useful! Best of luck! Here is a link that might be useful: comparison and review of natural eczema treatments

Fallingwaters, the biggest problem is dust -- much more than bacteria, but would it help to delay things a bit? If he needs to be in the house, do what you can to barricade the area, turn off the AC until the dust settles and then use a super cleaning filter for a short while, then change it. Sounds like he should be able to avoid the work zone outdoors and you can shed shoes, work clothes and do a hand washing anytime you or someone else comes indoors. May not be as bad as you think -- but check with the doctor if you are concerned. I forgot about my dog (mostly) and me getting sick from a gas leak when the appliances were first put in. The range top was fine, but the connection had a small leak and the regulator had to be replaced and the connection cleaned up. Our lab was throwing up and not eating -- I was getting really worried about her when we found out what was wrong. It was worse for her because she is smaller an because the natural gas itself is heavier than air and settles closer to the ground. The odorant would rise, but it was noticed mainly when we opened a drawer and they told us it was just the tiny bit that you might get when turning on the burners getting trapped in the drawer and nothing to worry about at first.

Thank you, Henry for that link. Very good info. from Dr. Kuska's link: "Dr. Kremer further shared his thoughts on the big claim of the biotech industry that we need GMOs to feed the world. He also discussed their claim of decreased use of pesticides. There has been a 527 million pound increase in pesticide use since the introduction of transgenic crops." More info. from Dr. Kremer, a soil microbiology professor: " They noticed that every time that they checked this GMO crop that the roots were loaded up with the fungus, Fusarium. Fusarium is a fungus that can be potentially pathogenic. He said his concern was that here we have this new release of crops that are tolerant to Glyphosate yet their root system are piled up with this fungi. He has evaluated several GMO crops over the past 17 years and continues to see increased fungi on their roots." I wish people would quit messing up nature, or what God has created. I find out that I'm allergic to the oil-wax used to coat citrus fruits (esp. lemons). When I use ORGANIC lemons without the oily wax, I have no problems. I find out that they also use cottonseed oil and fungicides to wax lemons. I have a history of being allergic to preservatives such as fungicides Sodium Benzoate and Potassium Sorbate in foods. To be safe, I no longer dunk lemons into water like I used to. Here's an excerpt from below link: " There are 21 fruits and vegetables that may be waxed: apples, avocados, bell peppers, cantaloupes, cucumbers, eggplants, grapefruits, lemons, limes, melons, oranges, parsnips, passion fruits, peaches, rutabagas, tomatoes and turnips. The waxes sometimes contain fungicides. Both the waxes and the fungicides are used to prevent spoilage, the former to retard moisture loss and prevent shriveling, the latter to prevent mold. Any fungicide allowed on the produce as it is grown may also be applied after harvesting, whether under the wax, in combination with it or alone. Seven fungicides are approved for use on food crops after harvesting. Of those only one, benomyl, has undergone a complete review by the EPA. Others are: thiabendazole, ortho-phenylphenol, sodium ortho-phenyl phenate, imazalil, dicloran and sodium borate. The EPA has classified benomyl a possible human carcinogen. In test animals, the chemical has caused birth defects, low sperm counts and mutations. Benomyl is registered for post-harvest use on apples, apricots, bananas, cherries, citrus fruits, mushrooms, nectarines, peaches, pears, pineapples and plums, either with wax or alone." http://cooking.stackexchange.com/questions/32358/does-wax-on-citrus-fruit-make-the-zest-unsafe-to-eat-or-compromise-its-flavor Another excerpt from above link to solve the problem with wax on citrus fruits, which impart a bitter taste to the citrus zest. "I've always just used warm (not hot) water, dish soap, and a soft brush to de-wax before zesting, and I've always been happy with the results. However, this question made me curious; in addition to beeswax, apparently carnauba (familiar from the carwash) and shellac are allowed."

Topical Immunomodulators (Elidel, Protopic) treat eczema by decreasing inflammation and immune system reactions. https://nationaleczema.org/eczema/types-of-eczema Because of the location on the legs, are you sure it is not stasis dermatitis? https://nationaleczema.org/eczema/types-of-eczema/stasis-dermatitis/